Attempt to add new spells and skills.

That's right - CUSTOM5 is a script-based spell for use during expeditions; it won't run on its own... it needs the corresponding script content!

As for SPELL_VASIK, it consumes mana when applied, but nothing happens, probably because SPELL_VASIK is executed, and the handler tries to find code for it, but there isn't any... because the .exe file doesn't have a reference to the SPELL_VASIK subroutine... i.e., for any non-existent argument, some procedure DO_SPELL returns false and jumps to some C3h code (return, i.e., a return occurs to the calling procedure).