Hostility

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Hostility is the game mechanic which determines the probability that any given character in your party is targeted by an enemy. Every character has the same base chance to get attacked, but this can be modified by character abilities that grant Hostility UpMore likely to be attacked
or Hostility DownLess likely to be attacked
. It can also be affected by support skills, character EMP, and weapon skills.
Hostility is ignored when any ally has SubstituteReceives foe attack in place of an ally
(Excludes all-foe all-ally attacks)
.

Hostility Formula

Every character has a base hostility score of 10. A character's chance to get hit is their hostility score over the party's sum total hostility score. Therefore, the base chance that any given character is targeted is:^[1]

10/(10 + 10 + 10 + 10) * 100% = 25%

Hostility modifiers act upon each character's hostility score. The sum of the hostility score can't be reduced to 0. Consider the scenario where one character has their hostility score boosted by 10. The chance that this character will be targeted is:

(10+10)/(10 + 10 + 10 + (10 + 10)) * 100% = 40%

Special Hostility

Some hostility buffs allow affected allies to either be always targeted or not targeted at all. The special hostility rule works as follows:

• For 100% hostility (Full Hostility100% chance to be targeted by one-ally attacks
  Full hostility has the same properties as Substitute, but has lower targeting priority than Substitute), hostility rule is ignored and always targets affected ally. The buff behaves exactly like SubstituteReceives foe attack in place of an ally
  (Excludes all-foe all-ally attacks)
  but with lower priority. The affected ally always receive one-ally attacks and receives foe's charge attacks which target specific allies (e.g. Iblis in Lucilius (Raid)) in place of targeted ally.
  • If there are multiple allies affected with this buff, only the ally in the highest slot will receive one-ally attacks and charge attacks, similar to interactions with multiple SubstituteReceives foe attack in place of an ally
    (Excludes all-foe all-ally attacks)
    effects.
• For 0% hostility (Into HidingLess likely to be attacked
  , ScurryLess likely to be attacked
  , and similar buffs), the ally's hostility value is forced to set to 0. The affected ally will not receive one-ally attacks. This doesn't prevent the affected ally to receive charge attacks which targets a specific ally.
  • When all allies have either status effects or support skills preventing them to be targetted, ally in the highest slot will receive one-ally attacks and charge attacks.

Known Hostility Modifiers

Ability	Hostility Up	Hostility Down
Assassin - Out of SightGain Hostility DownLess likely to be attacked Strength: -10. Target ally gains Hostility UpMore likely to be attacked Strength: +30.	30	-10
Ninja - NinjutsuBonus effects from seal combo. (Wind-Earth Seal)		0 (0% chance to be targeted)
Jamil - HideGrant an ally Hostility UpMore likely to be attacked Strength: +30Duration: 3 turns. Jamil gains Hostility DownLess likely to be attacked Strength: -10Duration: 3 turns.	30	-10
Baihu Fangstaff	20
Nene - I'm Watchin' You!Hey ugly! Looky here! (Nene gains Hostility UpMore likely to be attacked Duration: 3 turns. All other allies gain Hostility DownLess likely to be attacked .)	10	-2
Nene - Did You Just See That!It wasn't me! I didn't hit you, honest! It was her! (Transfer Nene's Hostility UpMore likely to be attacked Duration: 3 turns to an ally. Nene gains Hostility DownLess likely to be attacked Duration: 3 turns.)		-10
Andira - Sage of EternityGrant an ally Shield (2500)Next ATK received will be ineffective for a fixed amount Strength: 2500Duration: 3 turns for 3 turns and Full Hostility100% chance to be targeted by one-ally attacks (Can't be removed) Duration: 1 turn Full hostility has the same properties as Substitute, but has lower targeting priority than Substitute for 1 turn. At level 75: Shield endurance increased to Shield (3500)Next ATK received will be ineffective for a fixed amount Strength: 3500Duration: 3 turns. At level 90: Shield endurance further increased to Shield (4000)Next ATK received will be ineffective for a fixed amount Strength: 4000Duration: Indefinite and now has indefinite duration. Also grants 30% Bonus Wind DMGDeals bonus wind DMG for one-foe one-ally attacks (Ends upon taking DMG) Strength: 30%Duration: Until hit (Ends upon taking damage).	0 (100% chance to be targeted)
Hostility Up (Small)	5
Hostility Up (Medium)	8
Hostility Up (Large)	10
Hostility Down (Small)		-3
Hostility Down (Medium)		-4
Hostility Down (Large)		-5
Razia - On Solid Ground	10
Zahlhamelina - Solar Deflection		-5
Societte (Fire) - Closing Dance: Tokiyomi-aratameGain Closing Dance: Tokiyomi KaiFocusing on the dance and can't attack , 1 stack of Closing Dance: Tokiyomi KaiFire allies' multiattack rates are boosted from the dance and begin dancing. Recast to stop dancing. While dancing: Can't deal one-foe attacks while dancing. Gain 1 stack of Closing Dance: Tokiyomi KaiFire allies' multiattack rates are boosted from the dance after each turn (Max: 5). All Fire allies gain DA UpDouble attack rate is boosted Strength: VariesDuration: 0.5 turnsApplied during the attack phase. On the next turn, it'll have 0 turns remaining. and TA UpTriple attack rate is boosted Strength: VariesDuration: 0.5 turnsApplied during the attack phase. On the next turn, it'll have 0 turns remaining. when attacking. Buff effects increase based on stacks. On recast: Consume all Closing Dance: Tokiyomi KaiFire allies' multiattack rates are boosted from the dance stacks and gain equal amount of Closing Dance: Tokiyomi KaiFire allies' multiattack rates are boosted from the dance Duration: 1-4 turns stacks for up to 4 turns. All Fire allies gain DA UpDouble attack rate is boosted Strength: VariesDuration: 0.5 turnsApplied during the attack phase. On the next turn, it'll have 0 turns remaining. and TA UpTriple attack rate is boosted Strength: VariesDuration: 0.5 turnsApplied during the attack phase. On the next turn, it'll have 0 turns remaining. when attacking. (5 stacks)	100
Rosetta (Grand) - Elegant Rose BarrierActivate Rose BarrierRose Barrier is active . Rose Barrier gains 1 stack when Rosetta is damaged (Max: 5 stacks). Drains charge bar based on stack level for each turn Rose Barrier is active. Recast skill to release Rose Barrier. When released, all allies gain buffs based on the number of stacks. (costs 5% charge bar). At level 55: Charge bar cost removed.	70
Anthuria - Dance of DeliriumGain 60% Dodge Rate UpImmune to DMG and debuffs for a fixed amount while in effect Strength: 60%Duration: 3 turns, Hostility UpMore likely to be attacked Duration: 3 turns, and Dodge All (1 time)Takes no DMG or debuffs while in effect for a set period Duration: Indefinite.	70
Yngwie - Tough Guy mode	70
Rosamia (SSR) - Groundhold TalismanGain 100% DA UpDouble attack rate is boosted Strength: 100%Duration: 6 turns, 40% TA UpTriple attack rate is boosted Strength: 40%Duration: 6 turns and sharp Hostility UpMore likely to be attacked Duration: 6 turns.	50
Ayer - ProvokeYou want a shot at me? Go ahead! Take it! (Gain Hostility UpMore likely to be attacked (Can't be removed) Duration: 2 turns. Take a lethal hit without being knocked out if Ayer has 1% of his max HP or more.) At level 100: I swing my fists to protect others! (Gain SubstituteReceives foe attack in place of an ally (Excludes all-foe all-ally attacks) Duration: 2 turns [instead of Hostility UpMore likely to be attacked (Can't be removed) Duration: 2 turns] and Dauntless Spirit (1 time)Can withstand lethal DMG (Leaves 1 HP / Can't be removed) Duration: 2 turns.)	50
Aoidos - Bloody GardenGain 100% DA UpDouble attack rate is boosted Strength: 100%Duration: 6 turns, 30~35% TA UpTriple attack rate is boosted Strength: 30~35%Duration: 6 turns, and Hostility UpMore likely to be attacked Strength: +50Duration: 6 turns. At level 90: No longer gain Hostility UpMore likely to be attacked . Boost to TA UpTriple attack rate is boosted Duration: 6 turns's strength based on HypeATK is boosted lvl.	50
Spartan - GuardianGain DEF UpDEF is boosted Duration: 3 turns and Hostility UpMore likely to be attacked Strength: 50Duration: 3 turns. (Consumes 30% of charge bar.)	50
Therese (SSR) - CertamenGain DuelImmune to DMG and debuffs for a fixed amount while in effect / More likely to be attacked / Double attack rate is boosted (Can't be removed) Duration: 3 turns (Boost to double attack rate and hostility / Sharp boost to dodge rate).	50
Zooey (Promo) - Spinning Slash450% Light damage to a foe (Damage cap: 630,000). Gain Hostility Up (Stackable)More likely to be attacked (Stackable) Duration: 7 turns. (Consumes 20% of charge bar.) Hidden Effect: +10 to Stun for 180 seconds (when Stun reaches 100, inflict StunnedCan't attack Duration: 30 seconds on enemy for 30 seconds). At level 55: Damage increased to 500%. (Max stacks)	50
Baotorda (SSR) - Valiant ShieldGain BulwarkHostility and DEF are boosted / Speed up charge bar upon taking DMG (Can't be removed) . (Deals 40% less damage and doesn't deal multiattacks while in effect. Ends on recast.)	40
Sen (SSR) - Here GoesGain My Best ShotATK, DEF, multiattack rate, critical hit rate, dodge rate, and hostility are boosted Strength: 50% ATK Up / 20% DEF Up / 60% Dodge Rate Up / 70% / 30% Critical Up70% chance of dealing 30% more damage. / 100% DA Up / 10% TA UpMultiplier: PerpetuityDuration: Indefinite. (Ends upon taking damage 2 times.)	40
Veight - Noble BloodGain AwakeningATK, DEF, multiattack rate, critical hit rate, dodge rate, and hostility are boosted from awakening Duration: Indefinite, sharply boosting stats. When damaged twice, AwakeningATK, DEF, multiattack rate, critical hit rate, dodge rate, and hostility are boosted from awakening Duration: Indefinite is removed and Veight self-inflicts BacklashATK, DEF, and multiattack rate are lowered from awakening backlash Duration: 1 turn for 1 turn.	30
Anne - Follow the PrincessGain Counters on DMG (2 times)Counters upon taking DMG Strength: 250%Duration: 2 turnsCounter attacks grant 5% charge bar per hit. and Hostility UpMore likely to be attacked Duration: 2 turns. Consume 1 SpiritUses 1 Spirit per skill : Also gain 20% DEF Up (Stackable / Max: 100%)DEF is boosted (Stackable / Can't be removed) Strength: 20% (Max: 100%)Duration: Indefinite. At level 75: Effect enhanced.	20
Luchador - Knifehand StrikeGain Counters on DMG (3 times)Counters upon taking DMG Strength: 350% DMGDuration: 2 turnsCounter attacks grant 5% charge bar per hit., 30% DEF UpDEF is boosted Strength: 30%Duration: 2 turns, and Hostility UpMore likely to be attacked Strength: 20Duration: 2 turns.	20
Yuisis - No Surrender - No SurrenderSwitch to Heavensbane mode.	20
Yodarha - 0 Triple Shrouds	20
Marquiares - Earth, Wind, and Fire (Charge Attack)	20
Nectar - Shinsha's PrayerWhile Mana FlowDeals triple attacks / Bonus Wind DMG effect / Uplift effect / Hostility is boosted (Can't be removed) is in effect: Guaranteed triple attacks, 20% Bonus Wind DMG effect, 10% Uplift effect, and +20 boost to hostility.	20
Sword Master - Overpower	10
Agielba - Broad-Minded	10
Ghandagoza - SkybreakerInflict Solar CrownAttacks have a slight chance to miss Duration: 2 turnsLocal status effect on all foes. At level 90: Also deal 500% Fire damage to all foes (Damage cap: ~640,000).	10
Yggdrasil - Grace of the Great Tree	10
Zooey (Promo) - Spinning Slash450% Light damage to a foe (Damage cap: 630,000). Gain Hostility Up (Stackable)More likely to be attacked (Stackable) Duration: 7 turns. (Consumes 20% of charge bar.) Hidden Effect: +10 to Stun for 180 seconds (when Stun reaches 100, inflict StunnedCan't attack Duration: 30 seconds on enemy for 30 seconds). At level 55: Damage increased to 500%. (1 stack)	10
Threo - Berserk Forge		-5
Nemone - RoselleGain 70% Dodge Rate UpChance to dodge all attacks from foes (Upon dodge: Boost to charge bar and cut to hostility) Strength: 70%Duration: 3 turns. (Upon dodge: Gain Charge Bar +10%Instantly boosts Charge Bar by 10% Strength: 10% and Hostility Down (Stackable)Less likely to be attacked (Stackable/Can't be removed) Duration: Indefinite.) At level 75: Effect enhanced. (1 stack)		-5
Yuisis - No Regrets - No SurrenderSwitch to Heavensbane mode.		-5
Izmir - Immutable FaithGain 30% Charge Bar Gain UpCharge bar gain is boosted Strength: 30%Duration: 3 turns and Hostility DownLess likely to be attacked Duration: 3 turns. At level 90: No longer gain 30% Charge Bar Gain UpCharge bar gain is boosted Strength: 30%Duration: 3 turns and Hostility DownLess likely to be attacked Duration: 3 turns. Gain Ice BarrierWhile deployed: DEF, multiattack rate, critical hit rate, and charge bar gain are boosted / Debuff immunity / Hostility is lowered (Can't be removed / Ends when endurance hits 0) Duration: Indefinite and a shield effect worth 3000. (Ice Barrier ends when shield endurance hits 0.)		-5
Nemone - RoselleGain 70% Dodge Rate UpChance to dodge all attacks from foes (Upon dodge: Boost to charge bar and cut to hostility) Strength: 70%Duration: 3 turns. (Upon dodge: Gain Charge Bar +10%Instantly boosts Charge Bar by 10% Strength: 10% and Hostility Down (Stackable)Less likely to be attacked (Stackable/Can't be removed) Duration: Indefinite.) At level 75: Effect enhanced. (Max stacks)		-100

Source

Stacking

The following types of hostility modifiers stack (additively):

• Character Ability
• Support Ability
• Character EMP
• Weapon Skill

References