Old One's Army

The  is a tower defense-style event that contains cross-over content from the game, Dungeon Defenders 2. This unique event has many elements from the DD2 game that includes enemies, bosses, as well as the loot items. The music played during the event is also a nod to the tower defense game.

Conditions

 * The Tavernkeep NPC must first be found in the world. Once discovered, the Eternia Crystal and Eternia Crystal Stand can be purchased to initiate the event.
 * The crystal stand must be placed on a long, flat surface or the crystal will fail to be placed there and a status message will be given for the criteria needed.
 * Only one stand is needed as it does not consume with each summoning, but the crystal that is placed inside does consume with each event triggered.
 * The event won't trigger unless there is some kind of wall on each side of the play area for each portal to spawn against.

Game Progression
This event has 3 distinct tiers of difficulty, depending on when the player attempts to trigger it:

Pre-Mechanical Boss

 * Consists of 5 waves.
 * 5 total Defender Medals earned.
 * Contains the following enemies: Etherian Goblin, Etherian Goblin Bomber, Etherian Javelin Thrower, Etherian Wyvern, and Dark Mage (mini-boss).

Post-Mechanical Boss

 * Consists of 7 waves.
 * 25 total Defender Medals earned.
 * Contains all of the enemies from tier 1, as well as Kobold, Kobold Glider, Drakin, Wither Beast, and Ogre (mini-boss).

Post-Golem

 * Consists of 7 waves.
 * 100 total Defender Medals earned.
 * Contains all of the enemies from tier 1 and 2, as well as Etherian Lightning Bug, and Betsy (final boss).

Strategies

 * In general, it is best to lay down the Eternia Crystal Stand on a flat surface and give a good amount of room on either end so that there is more time to deal damage to the oncoming enemies.
 * Use the downtime wisely to rebuff, re-cast sentries, and gather any Etherian Mana left to place more ground sentries.