I Am Boot

You can choose to use the Acrobatics skill in place of Athletics when you attempt to grapple an opponent or when you try to maintain the grapple. When you grapple a creature you can latch on to one of its legs, doing this gives you advantage on every Acrobatics or Athletics check rolled to deal with the grapple and also reduces your speed to 0 and causes the targets speed to only become halved (and not reduced to 0 like grappling normally would). While grappled in this way the target cannot hit you with any single target attacks and you can’t spend your turn to do anything except continuing to grapple the target or ceasing to grapple them.

Special: For every ten turns that you keep the target grappled, they suffer one level of exhaustion. If they would reach the sixth level of exhaustion this way, instead of dying, they just fall unconscious for 1d12 hours.