How can I use Archimonde in a .AI file

I've tried, Warlock and Archimonde, but they don't work, it says unreconized variable.

Those names are actually constants that are declared at the beginning of common.ai and stand for the 4-letter-code. So either look for that constant in common.ai or look up the 4-letter-code and use it directly at the places where you would write the name.
The 4-letter-codes are used like that: 'hfoo'
You can also declare your own constants in your AI script (so it does not necessarily need to be in common.ai)