vital persistence?
No, it only reduces the natural drain, so it’s only worth it if you are planning to stay in death shroud for extended time.
Natural drain is 4% per second without the trait, and 3% per second with.
A mesmer is more then clones and trickery.
… and 2% per second with.
ftfy
IMO its must have trait for PVP.
For DS reliant necro it incrases dmg cause you can basicly cast 60 life blasts instead of 30.
For necro that just uses it for survibility its awesome too, it doesnt decrase the dmg incoming but you loose less DS and when you jump in DS to survive you will normally stay in it for some ~5 seconds at least, so you might not absorb any dmg but still you will loose less DS when pressured than without the trait.
And its 4% per second without and 2% with.