The True cloak of invisibility was once a part of Death's own cloak. With this, so long as you remain covered, you are invisible to all mortals, but still visible to those that have already died. It is virtually indestructible, can shrink or enlarge to cover up to three people, and will never lose its potency. However, it is not infallible. People can still detect you via non-optical means, and while the cloak itself is indestructible, it doesn't offer this boon to you.
Project V17/Powers/Shardless/Objects of Power/The True Cloak of Invisibility (Harry Potter)
From Worm CYOA Wiki
Master of Death
You accepted your mortality. As Master of Death, you understand that Death is part of life, and while it doesnt make you suicidal or reckless in any way, you are in peace with it.
You become biologically ageless, becoming younger and older at will. You know when death is coming to others, and can offer to let them have a peaceful death, and guide them to their afterlife. You gain a affinity for spells related to life and death, and know when someone cheated death. Whatever you kill, it become impossible to bring back.
The Relics now recognize only you as their master, and will only work for others if you lend or give it to them.