Exempt the healing-potion-on-Pestilence interaction from doing a roll versus monster MR, because in practice his MR is so high that it means healing potions are useless.

Hitting an earth elemental with a stone to flesh spell currently has no interaction, which is odd. The following possibilities have been proposed:

• It turns into a flesh golem. However, stone to fleshing a stone golem already does this, and if earth elementals are loose rock compared to the specifically built body of a golem, it doesn’t make as much sense.
• It instakills the elemental and turns it into a pile of meatballs. This may be a little too cheap.
• As above, but the elemental gets the standard chance to resist.
• It cuts the elemental’s HP and max HP and drops some meatballs, but only actually kills the elemental if this would bring its HP to zero.

Give Thoth Amon sleep resistance or higher monster MR, because right now it’s too easy to just zap him with sleep and finish him off trivially.

Cancelled monsters have lower monster magic resistance.

Polymorph forms should give intrinsic magic cancellation corresponding to the monster magic resistance stat of that species: 1 MC for 25+ monster MR, 2 MC for 50+ monster MR, and 3 MC for 75+ monster MR.

When you attempt to teleport to a square containing a monster, you exchange places with it rather than having the teleport fail and send you somewhere random. This possibly fails based on a monster magic resistance check.

You can somehow weaponize globs of green slime to forcibly transform other monsters into slime. Possibly this could be as simple as throwing or flinging the globs at them, perhaps subject to a monster magic resistance check for the transformation to work.

Merge magic cancellation and monster magic resistance into a single stat “magical protection” which determines how easy it is for the magical portion of attacks to reach you and deal effects. All races have a low innate MP, but armor can raise it higher. Most monsters’ innate MP resembles their current monster magic resistance.