Lava gremlins: a different gremlin species that reproduces in lava instead of water. It has at least one physical damage attack and at least one fire attack, and the regular gremlin intrinsic-stealing attack, except they steal intrinsics during any time that is not night.

Level that contains a structure with a lot of gargoyle statues. Some of the statues are statue traps.

Add gargoyles (or statues of gargoyles) to the Castle.

Wands of striking and digging tools deal double damage to all stony monsters like earth elementals, clay golems, stone golems, xorns, and gargoyles.