Homebrew, so called by analogy to home-brewing beer, is the creation of rules for personal use, whether entire game systems or just new rules material for an existing game system.

Homebrew is distinct from in that house rules are usually small ad hoc modifications of an existing system, while homebrew for an existing system is the creation of entire new subsystems, or of rules-heavy material like creatures, spells, equipment, and similar game material.

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