On a successful critical hit with its bite attack, a tiyanak deals an additional 2d6 points of damage and heals an equal number of hit points. The victim also takes 1d6 points of bleed damage. Any hit points in excess of the tiyanak's regular maximum become temporary hit points that dissipate after 1 minute. A tiyanak threatens a critical hit with its bite attack on a roll of 18-20 and gains Improved Critical (bite) as a bonus feat.