Imp Overlord

Tactics
The Imp Overlord has 2 attacks it can use. The first (and easiest to avoid) is an attack quite similar to the Ancient Wisps attack where flames come from the sky. It is easily noticed and can be dodged by either jumping or using a dodge ability. The second attack is a lunge where the boss swipes at you dealing damage if hit. While not necessarily hard to dodge, the attack moves quite fast and can easily harm you if you're distracted by a crowd of enemies.

The Imp is easily stunned by even the weakest attacks making it an easy boss for fast fire rate characters.

The Imp Overlord can drop the Imp Overlord's Tentacle

The Imp Overlord is also one of the two bosses in the game that can spawn as a blighted enemy when playing on monsoon difficulty for over 5 hours, the other being the scavenger.

Trivia
Imp Overlord is referred to as "Manager of the Jazz Hands" in the game files. Imp Overlord
 * The Imp Overlord was suggested by forum moderator Seria-Myouna on the Risk of Rain forums, while the sprite art was done by artist Deimera