A plan for magic traps to scale according to the depth they appear on. All these effects are still triggered just with the same magic trap - this isn’t adding new trap types.

Possibly remove polymorph traps as an independent trap type since it’s one of the options here.

When a monster triggers a magic (or maybe polymorph) trap, one possible effect is that they turn into a figurine of themselves with appropriate beatitude. However, the trap exploding on them is more likely, so that it can’t be used to farm figurines. A possibly evil addendum is that if the player would have otherwise died from damage from a magic trap, the bones file may contain a figurine of them instead of a corpse.

Polymorph traps have some percentage chance of disappearing whenever they polymorph anything (some people have suggested it always disappears). This is better for symmetry and means players might be able to deliberately polymorph themselves multiple times, but can’t abuse it on behalf of their pet.

Polymorph, teleport and levelport traps should disappear once used by any monster (including the player). Or else they have a low-ish chance of disappearing per each use.

Set the minimum dungeon level for polymorph traps to a deeper level, to perhaps 12 or 15. Polymorph traps now polymorph you in spite of magic resistance, but you can acquire some property (not as strong as polymorph control) that makes it much more likely or guaranteed that you will polymorph into a form that will preserve your armor and your hands.

Change the definition of polyselfless conduct to “You have never intentionally changed form.” If you step on a hitherto unknown polymorph trap and have an uncontrolled polymorph, the conduct is not broken.

Add a message for a monster you can see that polymorphs via a polymorph trap (or, come to think of it, any source, like the player zapping it at them).

Polymorphs from polytraps, on monsters, revert on death/time out the same as player polymorph. This is to prevent the mines having a balrog forever, or your nice pet archon becoming a leprechaun permanently.

Polymorph traps, when they polymorph the player, always choose a form considered to be “playable” - i.e. has hands, or is fast enough to run from threats, or is well-defended enough to sustain damage until transforming back, must have speed > 0 - but you do not re-form with your original HP when your polyform is killed, you merely die.

Polymorph traps do not instantaneously polymorph you; instead they start a short timer during which the player has time to either stop the polymorph from occurring (through healing potions, or prayer, or some other decently common consumable) or put on a ring of polymorph control or amulet of unchanging. However, magic resistance no longer protects against this effect.