OptionalfactionOptionaldetachmentOptionalattachedOther members of the combined ("attached") unit — the attached leader, its
bodyguard, or (11th) support attachments — whichever is not the selected
unitId. Their abilities are pooled onto the combined unit. A list so
multi-member attachments need no shape change; order is preserved.
OptionalsupportingFriendly units whose auras could apply (M2 walks only their aura-ranged abilities).
Overrides the unit's own
faction_idwhen given (for inheritance cases).