Bloodhunter's Bane

+1: This ancient pike was crafted with an immense tooth for a blade, has 10ft reach, heavy, 1d10 piercing and has +1 to attack and damage rolls.
+2: The weapon hungers for the blood of its foes, and deals +1d6 piercing damage to wounded targets.
+3: Weak wielders are driven mad, and 1/day, may be forced to make a DC15 Charisma saving throw, or be driven into a frenzy for 1 min.