[RPG] Does the Aid spell permanently increase HP for Necromancy wizards with the Inured to Undeath feature

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The aid spell increases your current and maximum HP, but only for the duration of the spell.

However, the School of Necromancy wizard's 10th-level Inured to Undeath feature (PHB, p. 119) says:

your hit point maximum can't be reduced.

Does that mean a character with the Inured to Undeath feature can increase their maximum HP permanently by having aid cast on them, since the increase from aid can never fade away even after the spell stops being active?

If this is the case, could repeated applications of aid over multiple engagements ratchet their HP upward each time and increase their HP infinitely?

Best Answer

PHB, p. 205

The effects of different spells add together while the durations of those spells overlap. The effects of the same spell cast multiple times don't combine, however.

Instead, the most potent effect-such as the highest bonus-from those castings applies while their durations overlap. For example, if two clerics cast bless on the same target, that character gains the spell's benefit only once; he or she doesn't get to roll two bonus dice.

RAW does not say that spells cannot stack, but that the effects of the same spells cannot stack.

As such the argument can be made that, since the HP max was never reduced again, the effect of the aid spell never actually disappeared, thus making the character ineligible to be targeted again by the spell, unless it's with a higher spell level; RAW states that the target is affected by the more potent spell effect. Even then, they'd only get the higher max HP bonus, not both.

It might still be a permanent max HP increase, but one that cannot be repeated, so it may not be necessary to counter it.

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