Once unleashed, the power of the K'daai's sorcerous fire is so great that it consumes even itself eventually and destroys the bindings holding them in shape.
Source: Warhammer Armies Project: Unofficial 9th Edition (v2.2)
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From the second game turn onwards, at the start of each of your turns a Toughness test must be made for each K'daai unit (roll once for each unit). If this is failed they suffer D3 Wounds with no save of any kind possible, distributed as per a shooting attack.