Soul Rebirth has a Passive component which will respawn the hero with 50% health at the location they died after 4 seconds; this effect has a cooldown of 180 seconds, which can be reduced with additional Cooldown Reduction.
Soul Rebirth provides +15% cooldown reduction which also affect it's own cooldown, so effectively it's normal cooldown is 180s.
When Soul Rebirth's passive effect triggers, an animation is shown of the hero rising from their body before finally respawning.
Killing a hero that has Soul Rebirth ready will still give kill credit and reward the instant souls, but the hero's corpse will not release additional soul orbs.
Killing a hero that has Soul Rebirth ready will trigger on-kill effects, such as Healbane's passive.