Red light, a y that has an explosion attack that causes paralysis. This is a reference to red lights in real life making you stop.
(There could also be green lights whose explosion gives a temporary speed boost, but since this isn’t harmful to the target it’s a sillier idea.)
Chromatic light, whose explosion attack causes you to see all monsters in random or consistently incorrect colors for a while.
A monster, probably in the y or e class, with an attack that steals an item (or a few items, excluding equipped gear) from your inventory and randomly teleports it somewhere on the same level. This makes object detection and detect treasure nice to use even after a level is fully explored.
Monsters with AT_EXPL kamikaze attacks are excluded from the regular is-this-foe-too-strong-for-me level checks. The point of those checks is to prevent a monster from attacking something too strong and getting hurt in retaliation, and if the attacker’s modus operandi is to blow itself up at the enemy, that isn’t relevant.
Exploding pets should not count against you when you kill them. (Not stated if this should apply only to pets which explode upon death, or it should apply to pets that explode even not upon death.
If polymorphed into a voluntarily exploding monster (e.g. a sphere or light), the player can #monster to explode without actually attacking anything. (You can already do this by forcefighting thin air, so this would just add an additional way to do it and a prompt when you polyself.)
When a light explodes, it permanently lights the terrain in a small radius centered on it. Black lights might only light in a radius of 1, or just its own space.
When a light explodes, all monsters adjacent to it are affected equally.
Will-o-the-wisps: gray or possibly bright blue y-class monsters that spawn individually, leave no corpse, and have no attacks except a passive blindness attack. They emit light radius 0 so you can see them, but no surrounding squares, across a dark area. Not infravisible, and could have teleportitis to replicate their folkloric effect of suddenly vanishing. Spawn rarely in swamp rooms and may not spawn at all in a lit area. Most importantly, they have a special AI that causes them to avoid the player and orbit around treasure (occasionally) or around hazards like monsters or traps (commonly).
Destroying a charged camera may spawn one or more yellow lights (or black lights if it is cursed).
Yellow lights possibly have a light radius of larger than 1. Also add white lights, white-colored y-class monsters which have a light radius of 3 or 4, with a blinding gaze attack and no explosion attack (unless keeping the explosion attack is too thematic to the y class, in which case it should blind for a long time).
