Stalker

The Stalker is a rare/uncommon NPC that can be found anywhere, from low level areas to high level areas. They usually are of a higher level than other enemies. They use similar abilities to other warframes. It may be a rogue Tenno (unconfirmed).

Abilities
It uses already existing abilities from other warframes.

-Ash's Invisibility

-Ash's Teleport

-Ash's Bladstorm (unconfirmed)

-Excalibur Slash Dash