Hydra Charm

This golden talisman is made of five twisting hydra heads and hung from a simple gold chain. While wearing this talisman, you gain the following benefits:

• When you use your reaction to make an opportunity attack, you can make a second attack against that same target as part of that reaction.

• You can make an opportunity attack, even if you've already used your reaction.

• When you are forced to make a saving throw against being blinded, charmed, deafened, frightened, stunned, or knocked unconscious, you can use your reaction to make the saving throw with advantage.

• When you take more than 25 damage from a single attack or effect, you can use your reaction to regain 10 hit points. If this damage would reduce you to 0 hit points but not kill you outright, you drop to 1 hit point instead and do not regain 10 hit points.

• When your head would be cut off by an effect, such as by a vorpal sword, you can use your reaction to negate the effect.

• Once a benefit of the talisman has been used, that benefit can't be used again until you finish a long rest.