So I'm trying to grind out bosses for the new weapons, till what I thought was lucky to have Excal Umbra as my frame through Duviri. But his unique function had some consequences when running around as the Drifter to finding the Undercroft.
To replicate this...just pick Excal Umbra, run the mission, get to Undercroft and enjoy the seizure of getting suck in between. I thought he'll be useful as a side kick- but nope!