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Ba is a person's life force. The name ba is not used in the English dub, where it is simple referred to as life force. When someone Summons or commands a ka, they lose ba. If someone loses all their ba, they die (get sent to the Shadow Realm in the dub). The strength of one's ka depends on the strength of their ba.
LP are the modern-day equivalent of ba.
- Yu-Gi-Oh! episode 213: "Village of Vengeance - Part 5"