Support blood splatters with no particular associated monster type (NON_PM). Such splatters will render as nondescript blood.

When saving a bones file, go through all the blood splatters on the level and set them to this nonspecific type. This avoids a bit of weirdness where a new adventurer enters the bones file, sees the splatters, and can immediately identify what type of monster each one came from.

A SpliceHack spell to make splatters of blood have a use case. It causes blood splatters in a area scaling from 3x3 to 7x7 around the caster (depending on skill) explode, dealing physical damage to things caught in the explosions. Blood splatters on the floor are cleared, and new blood being caused by something dying might be suppressed if it becomes too easy to repeatedly cast this for lots of explosions.

As proposed, this would be a level 5 attack or matter spell.

Make it possible to specify blood splatters in the SpliceHack level parser. Then add it to Orcish Town, the “massacre” and “temple of the gods” themed rooms, and the bottom floor of the Convict quest and possibly graveyards.