FoH: So, uh, where's the FoH-Holy Bolt synergy...

[GenericKen]

...in the skills.txt?

I don't see anywhere where the FoH HB stats are listed other than its healing.

I actually also have no idea where the undead-only damage conditional is for HB.

[Ruvanal]

You need to also look at the missiles themselves in many cases. In this case look in missiles.txt for the primary missile fistoftheheavensdelay and the sub-missile fistoftheheavensbolt to see damages and synergies. The #$%&Par2 and cHitPar2 fields are used to control the damage to undead only aspect of the holy bolt sub-missiles.