Code Geass has two power systems running in parallel: the supernatural Geass abilities (unique to each user) and Knightmare Frame combat (giant mecha piloting that determines military power).

Geass — The Power of Kings

Geass is a supernatural ability granted by a Code user (C.C., V.V.) manifesting uniquely in each recipient based on their deepest desire. Every Geass is different:

UserGeassLimitation
LelouchAbsolute Obedience — one irresistible commandRequires eye contact, one use per person
CharlesMemory RewriteRequires physical touch
RoloFreeze others' perception of timeStrains his heart — kills him if overused
MaoRead minds within rangeCannot be turned off — drives him mad

Knightmare Frames

Knightmare Frames are the primary military weapon — humanoid mechs powered by Sakuradite. They fight with Slash Harkens (wire anchors), energy shields, and frame-specific special weapons. Top-tier frames like Lancelot and Guren are operated only by elite pilots (Rounds-level) and can single-handedly turn the tide of battles.