Conjure Elemental

You call forth an elemental servant. Choose an area of air, earth, fire, or water that fills a 10-foot cube within range. An elemental of challenge rating 5 or lower appropriate to the area you chose appears in an unoccupied space within 10 feet of it. For example, a fire elemental emerges from a bonfire, and an earth elemental rises up from the ground. The elemental disappears when it drops to 0 hit points or when the spell ends. The elemental is friendly to you and your companions for the duration. Roll initiative for the elemental, which has its own turns. It obeys any verbal commands that you issue to it (no action required by you). If you don't issue any commands to the elemental, it defends itself from hostile creatures but otherwise takes no actions. If your concentration is broken, the elemental doesn't disappear. Instead, you lose control of the elemental, it becomes hostile toward you and your companions, and it might attack. An uncontrolled elemental can't be dismissed by you, and it disappears 1 hour after you summoned it. The DM has the elemental's statistics.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the challenge rating increases by 1 for each slot level above 5th.

A portal to one of the Elemental Planes of Air, Earth, Fire, or Water is opened, allowing the Magic-User to summon an elemental from that plane. At most one elemental of each type may be summoned by the caster in a given day. Once the elemental appears, it serves the conjurer indefinitely, provided the caster concentrates on nothing but controlling the creature; spell casting, combat, or movement over half the normal rate results in loss of concentration. The conjurer, while in control of an elemental, can dismiss it to its native plane at will (doing so on his or her Initiative if in combat). If the Magic-User loses concentration, control of the summoned Elemental is lost and cannot be regained. The creature then seeks to attack the conjurer and all others in its path. Only dispel magic or dispel evil will banish the elemental once control has been lost. An elemental may, of course, choose to return to its home plane on its own; such creatures will not choose to remain on the material plane for long.