Both the crystal and its stand are purchased from the Tavernkeep NPC for coins. An Eternia Crystal must then be placed on it by pressing the ⚷ Interact key on the stand. To initiate the Old One's Army event, an Eternia Crystal Stand must be placed first. Not only are its enemies extraordinarily resistant, it also employs numerous anti-cheat/exploit mechanisms, such as preventing the player from placing or removing blocks or liquids for its duration. This gear is specifically suited for the event, due to its exceptional level of difficulty. There are three different versions of the event: It first becomes available after defeating the Eater of Worlds/ Brain of Cthulhu (first tier), it then receives a substantial increase in difficulty after defeating any mechanical boss (second tier), and upgrades to its final version once Golem has been defeated (third tier).Ĭlearing later waves after wave one rewards the player with Defender Medals, a unique currency that can be used to purchase special weapons and armor from the Tavernkeep NPC. The objective is to protect it until all waves are cleared – if the crystal is destroyed, the event ends. Waves of enemies begin spawning from portals on both sides of the crystal, seeking to destroy it. The Old One's Army is a unique Dungeon Defenders 2 crossover event that can be triggered by placing an Eternia Crystal on the Eternia Crystal Stand.
