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I'm not 100% sure, but I thin you would make attack 1:
Attack 1
Elemental Bitsets: Normal
Damage Math: Normal
Extra Damage: 0%
Chaining: 10% chance to go to Attack 2
Attack 2
Elemental Bitsets: Critical
Damage Math: Normal
Extra Damage: 200%
So if you have your enemy who dies on getting hit with the bitset Critical, you have a 10% chance of killing him.
As for the crit stat, I can't think of a cunning way to use it to modify whether or not a crit triggers. You could replace AIM I suppose, but if you're planning to replace the CTR stat, then I'm not sure if that would work.
Then again, I haven't been working with attacks/enemies for very long. Legacy hasn't reached that development arc yet, so I might not be the best person to be answering your question, hehe.
Being from the third world, I reserve the right to speak in the third person.
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