Five times I’d tried to kill that murderous cockroach, and never managed it. Once I’d so thoroughly incinerated his corpse that all that’d been left had been a single hand, and still he’d walked out of that battlefield on two feet. Whatever it was the Dead King had done to this one, it’d made him durable beyond reason. Even wounds inflicted with Light came back in a matter of moments. His capacity to recover from damage might genuinely surpass what my body had been able to do at the peak of my time holding Winter.

...

I knew from experience that impaling him wouldn’t work for long – his healing was so aggressive that it shredded whatever went through him by sheer pressure – and that quartering only held him so long.

- Book 6, Chapter 66: Blind Pigs

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Light roiled and screamed as she severed an arm, but the Revenant only laughed – abandoning is greatsword, he caught his own limb and threw it at her face as a fresh one grew anew.

- Book 6, Interlude: Blood