Forms and stages
Normal Shape Shifter Curse forms progress through the initial, first, second, and permanent stages (*_0 through *_3). Experience unlocks stages, while the form's environment and instinct rules determine whether progress can continue. The permanent stage is the usual entry point for Shape Shifter Curse Addon endgame branches.
Stage changes can alter health, movement, abilities, equipment slots, and resource bars. A transformation is not automatically an upgrade: read the restrictions column on the form page before choosing a route.
Shape Shifter Curse Addon forms are special forms. They generally carry NoInstinct, NoCursedMoonEffect, SpecialForm, and InhibitorImmune, so normal stage progression and ordinary inhibitors do not apply.