Items / Outworld Staff
Outworld Staff is a special item in Dota 2 patch 7.41f.
Makes the caster completely invulnerable and disabled for 0.7 seconds. When returning to the world, the caster takes 5% of their maximum health as damage.
Damage taken when returning is non-lethal and disables Blink Dagger and other items that are muted upon taking damage.
Proof that the lone sentinel was not always so.