The Obligist path is probably the largest of the main life-paths of the Sea Kinden. The Archetoi build large structures, for reasons that no-one else is quite sure of. The important thing is that these can be made air-tight, filled with breathable air and then lived in by anyone, without the builders caring. This settled lifestyle is preferred by many and large colonies tend to be the important seats of power within the oceans.
The name likely comes from the word Obliged, since no obligist could live without the agreement of the Archetoi.