Replace Cavemen’s quest artifact with scales from the Chromatic Dragon (their quest then becomes “kill the dragon that is terrorizing our people” instead of “fetch the artifact from the dragon who stole it”). The scales only drop when she is killed, rather than her being generated with them (thus, they can’t be stolen). The scales could either be implemented simply as a base item akin to chromatic scales in UnNetHack which provide a cocktail of resistances, or as an artifact. If implemented as a non-artifact, the Caveman role will have no associated quest artifact.

The scales should NOT be enchantable into scale mail. The pile of resistances is good enough.

The Caveman quest goal level contains several dragon eggs of random colors beneath the Chromatic Dragon.

Make Big Stick (Caveman quest artifact in Fourk) deal two bonus attacks which may or may not hit (but it still all appears to be one hit). If both bonus attacks hit, the target is stunned and confused.