Serpents Curse

Though you may not look it, your being is tainted more from your snake lineage than the others.

• As a bonus action, You can transform your lower body.  Your legs fuse together and disappear into what now is a long serpents body. Your movement speed is reduced to 20.
• You can use your reaction to grapple a target creature with your snake body.
• You can now use your action to Constrict. 
• 1 minuet of concentration is required return your legs to their bipedal state.

Constrict. Melee Weapon Attack: + Dex modifier  to hit, reach 5 ft., one creature. Hit: 2d6 + dex bludgeoning damage, and the target is grappled(escape DC 14). Until this grapple ends, the creature is restrained, and you can't constrict another target.