Sentence ending with でもあった

Question

I found this sentence on a visual novel, and it's the first time I see でも+あった　at the end of a phrase, what does it mean?

This is the sentence:

だがその偶然はあらかじめ決められていた世界の意志でもあった。

Thank you in advance for your help

Answer 1

Conceptually speaking でもあった is what you get by trying to combine だった and も (as in "also").

だった is a contraction of であった and you have to use the uncontracted form in order to insert も after で.

So でもあった means "it also was".

(In the non-past tense, the same thing happens: "だ + も = でもある".)