Action Blocks is a tool for constructing complex animation sequences from simpler actions via a non-destructive node graph. It allows users to sequence, repeat, and layer actions to block out animations, cinematics, and animatics without destructive editing. The resulting actions preserve original keyframe data and curve handles without requiring baking or resampling, making them ready for further adjustment or use in the NLA editor.

The system supports advanced workflows including root motion application, where actions can be strung together while maintaining location and rotation offsets. Users can mix multi-layered animations, filter specific bone groups, and sequence shape key animations for dialogue. The tool also includes a dedicated one-click conversion feature for preparing Mixamo actions for root motion.