You can call up to 5 Alter Egos after obtaining Rhapsody in Crimson. (Note: If one has summoned 5 Alter Egos, and summons the Adventuring Fellow next, all Alter Egos get dismissed. One must always make sure that there's a slot for the Fellow before summoning it)
You can only summon one copy of each alter ego. This includes when one character has multiple versions (e.g. summoning Zeid II prevents summoning Zeid).
These alter egos support you in battle with the strategies and tactics you've come to expect from them.
Alter egos do not act except in battle, which officially starts after engaging and meleeing once. They will stop acting when you disengage.
If you kill a monster and auto-target another that has aggroed, some alter egos will cast spells on it, but they will not melee until you melee.
Trust magic can only be cast when not already involved in battle.
Certain instanced content will allow summoning even after initial aggro, but not after the player takes direct action on the monster or another player that has taken direct action.
Trust NPCs do not affect your experience gain.
Trust NPCs' levels and attributes vary based upon the summoning player’s level and/or Item Level.
For regular levels, Trust NPCs don't automatically level with the player. They must be dismissed and resummoned to match the player's level. Item Level changes are reflected immediately, which can be problematic with gear swapping.
Trust NPCs are not affected by zone potions obtained in blue caskets.
Trust Magic does not cause magic aggro.
Trust Magic cannot be cast while silenced.
Alter Egos are dismissed if the player is Charmed.
Alter Egos no longer despawn when spawning Voidwatch NM, making them usable during these battles.
Initiation quests for the Trust initiative are available, and you learn the first spell as you progress. Additional Alter Egos can be unlocked through completing various missions and quests.
Some NPCs, however, can only be obtained by trading specific items to an NPC offering the initiation quest. New Trust spells will continuously be added in future version updates.
Trust magic is not available in all areas or types of battle content, but may be expanded in the future.
Passive alter-egos are non-interactive NPCs that give a bonus as an aura. Most are technically Geomancers, but do not have to cast or recast. They cannot be interacted with in any way and will do nothing else but follow the leader.
Usage in Parties
Players can summon alter egos while in a party containing other players.
Only the party leader is able to summon forth alter egos.
Alliancescannot be formed when in a party comprised of both players and alter egos.