There should be some way to use the corpse of a disenchanter which had in life stolen some enchantment points from gear to “recycle” the magic. Possibly a ritual that recharges or reenchants items, or simply dipping it in a potion to turn it into a potion of gain energy.

Disenchanters should have a non-zero monster magic resistance, because it’s weird that they’re a magic-draining tough enemy to beat… unless you have a wand of polymorph or cancellation, in which case they become trivial.

You should be able to wield a disenchanter corpse and hit monsters with it to cancel them.

Touching a disenchanter’s body or corpse should be risky like a cockatrice is: it will cause you to lose a random intrinsic, the same as if you ate the disenchanter.

This should also happen if a disenchanter touches you and randomly picks an armor slot to disenchant that you aren’t currently wearing anything in.

Putting a disenchanter corpse into a bag of holding should make it explode.

Disenchanters derive additional nutrition from enchanted objects they eat akin to dNetHack disenchanters.

Magicbane’s usual special effects don’t happen when a disenchanter is being hit by it.

Disenchanters’ touch attacks can cancel individual items in your inventory (not just armor) as well as merely reducing the enchantment of armor. Or possibly add a new R monster that has this ability, and leave disenchanters as they are.

When a disenchanter hits you, it may drain charges from your wands instead of your armor.

Eating a disenchanter corpse sets Pw to 0.

Disenchanters can eat magical items for food like incantifiers do (i.e. draining the magic out of the item, leaving it as uncharged/cancelled/+0 or turning it into a mundane counterpart). This works for disenchanter pets, and for players polymorphed into them. Not specified whether this should give the player intrinsics.

Possibly, add a ‘magivore’ monster flag to represent monsters that can do this, though if only disenchanters are capable of doing this then it may not be needed.

Rust monsters and disenchanters should be q, because they are quadrupeds. (This would leave the R monster class empty though.)