Tier 2 consists of seven waves, with one or more Ogres serving as mini-bosses in the final wave.

Completing Tier 1 awards 5 Defender Medals in total. The final wave will only end when a Dark Mage is killed however, note that a single kill does not give enough points to instantly end it unless the wave is mostly already finished. Tier 1 is triggered when the event is summoned before any mechanical bosses have been defeated.

Tier 1 consists of five waves, with one or more Dark Mages serving as mini-bosses in the final wave.The event comes in three possible tiers, depending on game progression when the event is triggered: At the end of each wave, there is a 30-second countdown to the next wave, signified by a timer appearing over the Eternia Crystal. The event consists of a set number of waves, with each wave becoming progressively more difficult (see wave chart). In addition, closed trap doors are considered flat, and can be successfully opened and/or reclosed after the event has started. Platforms and inactive blocks do not count as part of a flat floor, and will count against the three-tile height allowance but floor blocks with Actuators on them that are solid when the crystal is placed will count as flat, and can be successfully actuated after the event has started. The player can build up to a height of three tiles before blocks are considered obstructing the necessary space. 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 вљ· 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, 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), 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).Д¬learing 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 вЂ“ 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.

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