An Effective Character Level (ECL) is a number that represents a creature's overall power relative to that of a character from the Player's Handbook. A creature with an effective character level (ECL) of 10 is roughly equivalent to a 10th-level character. A creature's ECL is the sum of its hit dice (including class levels) and level adjustment.

For instance, a 2nd level Drow Wizard has 2 HD and a +2 level adjustment. It is the equivalent of a 4th-level character.

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