Phantom Brigade

Phantom Brigade is a Standard Chaos Arcana in Wizard of Legend

Description
Summons five allied Chaos Knights which deal 5 Chaos damage on hit. They will despawn after 4 strikes or when there are no enemies left nearby.

The Charged Signature version summons one knight of each base five element. All of them deal 10 damage of their respective element, except for the ice one which does twelve, and they are guaranteed to apply their respective status effects on hit at level 1: burn, poison, shock, freeze, and slow. However, the slow appears to uniquely be level 5 or higher, lasting longer than 2 seconds(requires testing). The fire and earth knights despawn after after 3 attacks, lightning after 4, freeze after 5 and air after 6.

The summoned knights cannot be damaged or destroyed by enemies.

Strategies
This arcana is quite versatile, being able to help clear rooms full of enemies, or deal heavy damage to isolated ones. The Phantoms summoned are largely autonomous. This means while the player is largely unable to control them, they also leave the player great freedom in when they use it and what they do while it's active.

Additional notes

 * Although Chaos damage can open any single lock on elemental chests, it can be difficult to use this arcana for that purpose, requiring the player to lure an enemy into a position where a Knight will inadvertently strike the chest.
 * This is not considered a summon arcana anymore (patch v1.22) so relics that work with summons like won't have any effect on this.