Rivulets of blood gush down the flensed face of this red metal mask.

If you are wearing a mask of blood when you enter a rage or frenzy, that ability lasts for 1 round longer than normal. This is a continuous effect and requires no activation.
The liquid flowing over a mask of blood is normally harmless, but when you activate the mask, you can spit a stream of blood as a ranged touch attack (range 30 feet). This stream deals 4d6 points of acid damage to the target. This ability functions two times per day.

Prerequisites: Craft Wondrous Item, Melf’s acid arrow, rage.
Cost to Create: 1,500 gp (plus 300 gp for base item), 120 XP, 3 days.