Special Moves and Abilities
Serpent Arrow is a Special Move.
- “Fires a snake at the target, poisoning them in addition to normal damage with a successful hit. The archer must be skilled in poisoning and nimble of hand to achieve success.” 
Mobiles Using Serpent Arrow
Mobiles which can train in Serpent Arrow
This only lists mobiles which can train in Serpent Arrow 'out of the box'. Some additional mobiles may also be able to train Serpent Arrow if their initial set of abilities and moves is modified.