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"When you use your healing channel, you can expend a mystic spell slot of the highest level you can cast to also deal damage equal to the amount you heal to all undead foes in the area."
If a 4th-level mystic with this feat has expended all of their available 2nd-level slots for the day, would they be able to use their 1st-level spells, since that's now the highest they can cast? I'm a little torn which way to lean on this. If they can't, then it means that mystics lose total available uses of this ability whenever they gain higher spell levels. If they can, then mystics may have too many available uses of it (though they'd still be limited by resolve points).
I'm pretty sure it's the first one. After all, healing channel scales with level (by one level faster than spell level)
You could rule it that they can use a lower level slot and a lower level channel, but I think that opens their options up a bit too much.
well consider that your spending a resolve point and loosing a spell slot. Personally I think its highest your able to cast at the time. Even allowing this your limited by the number of resolve points and available spells to cast.
Considering you also sunk a feat into being able to do this the cost seems pretty steep if where limited to your total highest spell slots. It would make it one of the most expensive to use niche spells in the game.
"highest level you can cast" means at the time of casting. Otherwise they would have written, "highest level you care capable of casting" which would mean the highest slot you are capable of casting by level.
If you have expended all your higher level slots, the next highest you have available would suffice.
Burning a Resolve Point AND a spell slot as well as either a move, standard, or full action is quite costly. Especially considering the undead receive a saving throw and it only affects a specific subset of potential enemies.
Don't forget, you also get the benefit of the healing as well.
I think the catch of this spell is the timing associated with it. You don't get to choose the spell slot. That's a pretty big deal. If you have a couple of big spells you want to hold on to, but are being swarmed under on Eox by a horde of undead, you have a tough decision to make. Use the high end slots so this doesn't consume them, or use one for potentially decent damage if the enemies don't save.