
The floor may not have holes wider than 1 block.Additionally, tiles above the floor may not be immediately next to the Eternia Crystal Stand.A minimum clearing of 10 tiles vertically is required (i.e., between the "floor" and the "ceiling", if there is one).The enemy portals will spawn further away if given the space, however: up to 120 tiles away from the center of the stand on each side. A minimum clearing of 61 tiles horizontally is required on each side of the Eternia Crystal Stand, measured from the center of the stand (a 123-tile clearing in total, with the stand at the center tile).If they are not fulfilled, the Eternia Crystal cannot be placed successfully, and a status message appears informing the player that the surface is inadequate. Summoning this event has some unique requirements for the terrain around the summon area. The Tavernkeep can be found randomly in a world after the Eater of Worlds or the Brain of Cthulhu has been defeated. 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 ⚷ Open / Activate 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, but it also employs numerous anti-cheat/exploit mechanisms, such as preventing the player from placing or removing blocks or liquids for the event's duration. This gear is specifically suited for the event, due to its exceptional level of difficulty, and stronger equipment is unlocked with each progressed tier.
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After defeating Golem, the event reaches its third, final tier of difficulty, with the full range of enemies and mini-bosses present in some way during the seven waves.Ĭlearing later waves rewards the player with Defender Medals, a unique currency that can be used to purchase special weapons, armor, and the Defender's Forge from the Tavernkeep NPC.

After defeating any mechanical boss, the event receives a substantial increase in difficulty in its second tier and gains two more waves, totaling a maximum of seven.After defeating the Eater of Worlds or Brain of Cthulhu, The Old One's Army is unlocked in its first tier with an initial maximum of five waves.There are three different versions, or "tiers", of the event: The objective is to protect the Eternia Crystal until all waves are cleared – if the crystal is destroyed, the event automatically 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.
