Undying Sentinel Starting at 15th level, when you are reduced to 0 hit points and are not killed outright, you can choose to drop to 1 hit point instead. Once you use this ability, you can't use it again until you finish a long rest. Additionally, you suffer none of the drawbacks of old age, and you can't be aged magically.
Det här var vad Jeremy Crawford hade att säga i en tweet:
The Undying Sentinel feature protects you from the drawbacks of old age, including dying of old age. You can still be killed, but not by the accumulation of years.
Twitter link for 5:45 PM - 7 Dec 2017
Så du får full odödlighet. Är det trasigt som helvete? Japp.