Rings of regeneration should drain your Pw instead of your nutrition. When you’re at 0Pw, you stop regenerating.

New artifact The Golden Knight, a gold small shield that has the following properties:

• Sets strength to 25 when worn like gauntlets of power.
• Cannot be invoked directly, but if you fall below 25% of your HP maximum when your invoke timeout is good, it automatically invokes itself to take half of your current Pw points and heal you for that much HP.

If this doesn’t seem powerful enough, remove its strength effect and make the base item a shield of reflection instead.

Eating the brains of a spellcasting monster should restore some magic energy, and perhaps even have a chance of learning a spell from its brain. (This latter part would work better in variants such as FIQHack where monsters have a list of player spells).

Using #monster when polymorphed into a demon allows you to call for hell-p from other demons directly, without needing to hit an enemy in melee. This uses up some Pw. It may not work 100% of the time, but will cost Pw regardless of whether or not it works. Another possible restriction is that you need to be next to a known enemy for it to work.

Ring that provides magic resistance, but hinders your own spellcasting while you wear it by increasing your spell failure rates. Additionally, it gradually drains your magic energy while being worn. If you have no energy, the ring stops providing magic resistance.

The Amulet drains your power when you cast spells, even if you’re not carrying it, if it’s on the ground nearby. The amount of power drained is proportional to your closeness to it.

The potion of gain energy has a minimum substantial percentage of your Pw pool that it will refill. Like healing potions, it will only increase your maximum Pw if you would have gone over your maximum.

Monsters can now zap cancellation at the player; effects of cancellation on the player include draining Pw (and possibly maximum Pw if Pw hits 0) and removing magical temporary intrinsics such as invisibility, speed, and detect monsters. It does NOT cancel the player’s entire inventory, as this does not happen when the player zaps cancellation at a monster.

An artifact often gifted to Barbarians which provides magic resistance and half spell damage but prevents Pw from regenerating. Or assign these properties to the Heart of Ahriman, which makes it good for Barbarians as they rarely cast spells.

Trying to cast a forgotten spell and getting nightmarish images in your mind drains a few points of Pw.

Buff the potion of gain energy so that it refills around 100 points of Pw. If this would take you above your normal Pw maximum, you get temporary Pw equal to that difference.

Eating a disenchanter corpse sets Pw to 0.

You get a small Pw boost (similar to newts, or perhaps not boosting max Pw)? by eating the corpse of a spellcasting monster.

Electric eel corpses increase Pw/maxPw to an extent greater than newts.

Eating brains while polyselfed into a mind flayer recovers magic power instead of nutrition.

Potion equivalent of extra healing for magic power, or else some consumable way to recover 20-40 power in one go; the normal potion of gain energy is currently more useful for raising maximum power than it is for restoring it. This new thing need not be more effective than gain energy is at raising maximum energy. (Perhaps “potion of restore energy”, which does not raise maximum at all.)