The boss has three health bars - it transforms after each one is depleted.
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Pure gaming term. Use 血条 for the on-screen bar; 血量 (xuèliàng) for the HP value itself. Common verbs: 掉血 (diào xuè, lose HP), 回血 (huí xuè, regenerate), 满血 (mǎn xuè, full HP). The 血 ('blood') feels more vivid than English 'health'.
