Otiluke's freezing sphere

Otiluke's freezing sphere was an evocation spell that freezes water and/or deals cold damage. It was presumably developed by Otiluke.

To Zakharan mages, always reluctant to acknowledge ajami names and accomplishments, the spell was known simply as freezing sphere, and counted among the spells of the province of sea.

Effects
Otiluke's freezing sphere is a multipurpose spell. You can cast any one of the following three versions:

Frigid sphere
A tiny sphere of freezing matter streaks from your fingertips to up to long range (400 feet + 40 feet/level) to strike a body of water or a liquid that is principally water. When it strikes such a target, it freezes the liquid to a depth of 6 inches over an area equal to 100 square feet (a 10-foot square) per caster level. This ice lasts for 1 round per caster level. The sphere has no effect if it strikes a creature, even a water-based creature, but creatures swimming on the surface of frozen water become trapped in the ice. Attempting to break free is a full-round action. A trapped creature must succeed at a Strength check (DC 25) to do so.

Material components
A thin sheet of crystal about 1 inch square.

Cold ray
A ray of cold springs from your hand to close range (25 feet + 5 feet/2 levels). You must succeed at a ranged touch attack to hit your target. The ray instantaneously deals 1d6 points of cold damage per caster level (maximum 20d6).

Material components
A small, white ceramic cone or prism.

Globe of cold
You create a small globe about the size of a sling stone, cool to the touch but not harmful. This globe is a grenade-like weapon and can be hurled either as a thrown weapon (range increment 20 feet) or in a sling. The globe bursts on impact, dealing 6d6 points of cold damage instantaneously to all targets within a 10-foot radius. Affected creatures can attempt Reflex saves for half damage. If you do not hurl the globe, it bursts on its own after 1 round per caster level. You can command the globe to burst sooner if you wish, but the time cannot be changed once set (though it still bursts on impact after being hurled).

Material components
A small crystal sphere.