Goblin Spirit Guide

The Goblin Spirit Guide is a Hardmode enemy found on the Surface during the Goblin Army event. It will walk slowly towards the player; when active, all Goblin Army enemies will turn into Goblin Spirits upon death, which turn into Shadowflame Revenants if the Goblin Spirit Guide remains alive for its casting duration.

Trivia

 * Despite the Shadowflame Revenant appearing to be ethereal, its gibs are the same as a Goblin Thief.