This spell enables the caster to open a portal to one elemental plane of his choice (as appropriate for his patron Power). He can then summon elementals from that plane.
After the first turn of casting, 3d3 elementals of 12HD each appear; after the second turn, 2d3 elementals of 16HD each appear; after the third turn, 1d3 elementals of 20HD each appear. Each elemental has at least 5 hit points per hit die. The elementals remain for six turns from the time they first appear.
These elementals will obey the priest explicitly and cannot be turned against the caster. The priest does not need to concentrate to maintain control over the elementals. They cannot be dismissed with spells such as dismissal; the elementals remain for the duration of the spell.