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opcode 12 "drain hp to caster"
Anyone played around with this option? It looks like it was maybe meant to be a fix for 2-part spells like Larlochs and Vampiric touch. However in my testing the drained HP is basically permanent no matter what timing modes you choose. Looking at the savegame file in EEkeeper, a character who has used a custom spell with this effect gets an opcode 18 maximum hp bonus with an absolute duration with a 10 digit duration attached.
Is this just unusable or is there some trick to it?