Increased jump height, jump speed, immunity to fall damage and autojump 40% increased movement speed Every 10% of health lost gives: +8% damage to most boosted damage type Expert
Rajah Rabbit's Sash of Vengeance is a Hardmode tier Expert Mode-exclusive accessory that is obtained from the Treasure Bag dropped by Rajah Rabbit. It grants increased jump height, jump speed, autojump and immunity to fall damage as well as 40% increase to movement speed. Also, every 10% of health lost (About 50-60 HP) grants 8% increased damage to most boosted damage type. (If you are melee, your melee damage is boosted etc.)
Trivia
The damage boost you can get at the lowest health threshold possible is: (At 50-60 HP) +72% increase to your most boosted damage type.
If you are doing a no wing challenge, this accessory can be really useful to acquire as it grants boosts to movement for a majority, also making your life easy while moving around and dodging enemy attacks.