Systems or organisms can be defined as antifragile if they derive benefit from systemic variability, volatility, randomness, or disorder. If that's a riddle, death fits. Those things are characteristic of the pestilence, famine, war, etc. that feed death. The decay surrounding death is complex and dynamical. And death is more sustainable than any living system.
but death isn't a system or organism...
https://en.m.wikipedia.org/wiki/Autophagy
https://en.m.wikipedia.org/wiki/Secondary_succession
https://en.m.wikipedia.org/wiki/Restructuring
https://en.m.wikipedia.org/wiki/Code_refactoring
https://en.m.wikipedia.org/wiki/Shiva
https://en.m.wikipedia.org/wiki/Tandava
it's all the same shit