Hero of Etheria
Uncommon11.8%ObjectiveOptionalAnywhere
Repel the strongest forces the Old One's Army can muster.
The Old One's Army tower-defence event: buy the Eternia Crystal and Stand from the Tavernkeep (he wanders in after the Eater/Brain dies), plant them on a long flat run, and defend the crystal through the waves. This achievement wants Tier 3 - available post-Golem - beaten. Build with the Tavernkeep's Defender Medal sentries, hold both lanes, and prioritise the Betsy fight at the end; her wings and weapons are the event's best loot.