Does Summon Nature's Ally require that something of that type is in the area? I've always been unclear on this. I know that Summon Monster spells call the creaturs from other planes, but can I, for example, summon a corcodile in the desert?
Also, in this passage:
Cinder Cloud (Ex): The burning wood that forms the body of the horror is filled with hot cinders. These are released in a choking cloud whenever a physical attack successfully inflicts damage against it (by either overcoming or bypassing its damage reduction). The cinder cloud forces any creatures within a 10-foot radius to make a DC 19 Fortitude save or be sickened for 1d6 rounds. Creatures that do not need to breathe are immune to this effect. The save is Charisma-based (as the charred horror has no Constitution score).
What does the last sentence mean?