Dance of the Dead

This long room has two exits. Along one wall is a tapestry depicting a dance of the dead. When PCs approach within 30′ of the tapestry (which is necessary to move from either of the exits to the other), an eerie music strikes up, and 13 skeletons emerge from the tapestry, stand in a line and wait for one combat round. If any PCs begin dancing within that combat round, the skeletons will join the PC in a dance for 13 combat rounds, then bow, and return to the tapestry. Any PCs who do not dance will be attacked by the (normal) skeletons.