Because I can summon, create, or conjure allies to my aid, once per session I can bring one or more NPCs into play in a conflict.
Suggested NPC statistics: If the character summons a single NPC, give it an approach or an NPC skill like "Supporting (player character)" at the PC's highest approach +1. They will have the same number of stress boxes as the PC, but no consequence slots. You can summon more than one NPC, but reduce their approaches and drop one stress box per extra NPC summoned. So three NPCs would have the PC's approach at -1, and one stress box each.