Quake Champions - Nyx
FATHOM AGENT
Ages have passed since the peaceable Melem learned to harness the Fathom Orb, imbuing themselves with a trace of its baleful energy to enable “Ghost Walk” — a momentary phase-shift into another dimension. Even when they were sieged by hulking, chitinous marauders, the Ghost Walk saved them as it had many times before. Then, the unthinkable: One of the attackers returned and breached the Orb. With no alternative, the Melem broke their inviolable law and sent their most skilled assassin to the Fathom Orb, not knowing whether she would survive, let alone how she might return.
GHOST WALK
Nyx moves into another dimension becoming invisible and immune to any damage. Nyx will instantly kill any opponent occupying her materialization spot.
Source: Bethesda.net
I personally think it's better to not have characters with invisibility in games like this because of how powerful it is to be able to easily escape fights or initiate fights on your terms. It's very frustrating to play against invisibility in every game I've tried and I often play stealth classes myself.
I'll have to wait until I try the game to see how it works but these are my initial thoughts based on experiences from other games.
Granted it can still be pretty powerful regardless of that.