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You indicate a place, either on a vertical or horizontal surface, using intricate binding circles written in sacrificial blood. When completed, a doorway to the flames of hell is called into being at the designated location, allowing you to call forth evil [[SRD:Outsider Type|outsiders]] to greater effect. This is a one-way portal to a single Lower Plane of your choice and cannot be used to enter that or any other plane, although any creature that passed into the [[SRD:Material Plane|material plane]] through the hellmouth can return back normally. A hellmouth is big enough to let creatures of up to [[SRD:Gargantuan Size|Gargantuan]] size pass through.
As the hellmouth opens, a portion of the essence from the lower plane on the other side pours through the portal, emulating certain planar traits inherent to that plane in the portal's vicinity. As a result, in a 1-mile radius around the hellmouth, any [[SRD:Outsider Type|outsiders]] native to the plane on the other side lose their [[SRD:Extraplanar Subtype|Extraplanar]] subtype and cannot be banished or otherwise compelled to return to their home plane. Any [[SRD:Outsider Type|outsider]] native to the connected plane within 200 feet of the hellmouth that same radius is empowered, gaining a +4 [[SRD:Enhancement Bonus|enhancement bonus]] to all physical ability scores ([[SRD:Strength|Strength]], [[SRD:Dexterity|Dexterity]] and [[SRD:Constitution|Constitution]]) as well as a +4 profane bonus to their attack rolls, [[SRD:Armor Class|Armor Class]], saves and [[SRD:Spell Resistance|spell resistance]].
When using your hellmouth to summon fiends from the plane on the other side, the effective level of the [[SRD:Summon Monster I|summoning]] spell increases by 2; a [[SRD:Summon Monster I|summon monster I]] becomes a [[SRD:Summon Monster I|summon monster III]] and you can use a [[SRD:Summon Monster IX|summon monster IX]] spell to call up to 1d4+1 similar creatures from the Level 9 creature table. Furthermore, the duration of any summoning spell that summons a fiend from the plane on the other side increases tenfold ([[SRD:Round|rounds]] become minutes).
