Operator: Logarithm is a Number Spell Piece added by Psi. It will return the logarithm of a number. For example, . By default it operates using base 10, but it can be changed in its parameters. It is unlocked in the lesson "Secondary Operators."
- Target: Requires a number.
- Base: Optional. Requires a number. Omitting this will have Operator: Logarithm work in base 10.