D20:Level Spell Descriptor

===Level===
The next line of a spell description gives the spell?s level, a number between 0 and 9 that defines the spell?s relative power. This number is preceded by an abbreviation for the class whose members can cast the spell. The Level entry also indicates whether a spell is a domain spell and, if so, what its domain and its level as a domain spell are. A spell?s level affects the DC for any save allowed against the effect.
Names of spellcasting classes are abbreviated as follows: bard Brd; cleric Clr; druid Drd; paladin Pal; ranger Rgr; sorcerer Sor; wizard Wiz.
The domains a spell can be associated with include Air, Animal, Chaos, Death, Destruction, Earth, Evil, Fire, Good, Healing, Knowledge, Law, Luck, Magic, Plant, Protection, Strength, Sun, Travel, Trickery, War, and Water.

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System Reference Document