Bandit: Sadist

 is a challenge in Risk of Rain 2. It is completed as Bandit by killing a monster with 20 stacks of Hemorrhage.

Tips

 * A monster with a lot of HP, most likely a boss, will be required for this challenge. You might need to wait for later stages in order to find an adequate target. Shrines of the Mountain can help summon stronger teleporter bosses early on.
 * A possible target would be the Alloy Worship Unit - incredibly tanky and able to survive multiple stacks of Hemorrhage without dying before the required stacks can be applied.
 * will greatly help by stacking uses of Serrated Dagger.
 * Having 2 will reduce the cooldown of Serrated Dagger to 1 second, allowing you to spam the attack. (A third would lower it further to the cap of 0.5 seconds, though this is overkill.)
 * also helps with spamming Serrated Dagger, which should give you extra time to stack most of the Hemorrhage stacks you need.
 * Serrated Dagger only causing hemorrhaging on critical strikes, can help negate the need to perform backstabs to apply stacks of Hemorrhage.