After playing through more vaults I thought of ways of how to potientially increase their replay and rewards. This is a retooling of a previous suggestion.
With the unique properties of Vaults, how they reset and respawn everything and they have the buttons that open doors, 2 Vault Shrines will be placed in the entry way of each Vault. Putting a Sigil of the Vault into the Shrine will cause it to reset, and become the Higher difficulty. Setting to the higher difficulty locks the dungeon from new players entering till it resets.
Difficulties and Changes:
Introduces Ambush Spawns that spawn in the hallway behind you primarily, or ahead of you in the room. These occur on Difficulty Medium and Hard. The spawns will use a similiar mechanic to Maelstrom lightning, but like smoke, or crawling from the ground, etc.
Base difficulty can be solo’d, current difficulty
Medium (1 Sigil) is meant for 2 people + 2 thralls
Ambush Enemy Spawns
2x Eldarium and 2x damage to Thralls.
Hard (2 Sigils) is meant for 3 people + 3 thralls
Ambush Enemy Spawns, Double Enemy Health
3x Eldarium and 3x damage to Thralls.