Making a spell that exclusively heals undead

Dracoqwerty

I'm trying to make a spell that harms living creatures and heals the undead, but I have not found any opcode that lets me heal a certain creature type - is there a way to do this?

jmerry

Doing it in a single action? Probably not. You need to chain things, like raise/resurrection spells do in 2.6. Opcode 326 to target only undead, then a sub-spell with the actual payload.

For the living-only half of the spell you want, I'd recommend another sub-spell, with an effect to make undead immune to it.

kjeron

You can also do it with two EFF files, if the damage/heal is the only thing you want separated (all audio/visual effects are the same for both).
EFF 1 applies heal
EFF 2 applies damage.
Use op177 to apply the first to only Undead. Use op318 to block the second EFF from affecting Undead.

jmerry

Or immunity effects could be used on both sides. False Dawn, for example, uses an op324 to block it from affecting non-undead.

On closer examination, there are really quite a lot of ways to make this work.