Old Guillotine

Old Guillotine is a new item in Risk of Rain 2.

The item will instantly kill an Elite enemy that falls below 13% (+13% per stack) health.

Math
The threshold at which it will activate is determined by the formula

Trivia

 * The Old Guillotine is currently the only item to have undergone a rarity change. It was originally added as a Common item before later being changed into an Uncommon item.