The material below is Open Game Content
Head-hurling monk skeletons (22) CR 1/3
hp 6 each; SRD (human warrior skeleton) with the following changes
Init +7; AC 15 (touch 13, flat-footed 13); Ref +2;
Ranged skull +3 (1d3+1); Dex 17; no scimitar or shield
During Combat The skeletions in the open alcoves hurl their skulls at the PCs before closing to attack with their claws. The skeletons in the sealed alcoves reach through the openings to claw at PCs as they try to navigate the corridor.