Invisible Vessel of Kulemak boss

Diring Kulemak boss fight his vessel becomes invisible when exploded.
If you cull him with Lighting Warp his body explodes and he becomes invisible for the rest of the fight.

Just encountered this. After the first fight he was invisible. When I chose to fight him in his final form, he did reappear, but then he had no health bar.

Can confirm. Culling with Lightning Warp seems to make the boss modell turn invisible. I was still able to deal damage to it/kill it but could not target it nor did the boss HP bar at the top show.

Same here, 3 iinstances now, hes either completely invisible and i die to whatever attack he uses i spawn back in and now hes visible but no healthbar, Im using infernalist perm demon form. I know they had issues with demon form and bosses before.

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Wookiee#0372 wrote:

Same here, 3 iinstances now, hes either completely invisible and i die to whatever attack he uses i spawn back in and now hes visible but no healthbar, Im using infernalist perm demon form. I know they had issues with demon form and bosses before.

Actually to confirm I just read fully and im also using lightning warp.

I just managed to record both things happening, the invisibility and the bosses health bar vanishing if the video is needed.

lightning warp user here, can confirm, he just goes invis now

Lightning warp here too. Final stage of the boss was invisible with no health bar. Was completely confused as to what was going on and got killed.
Had to google a youtube video to see if I was doing some mechanic wrong, but no, game was just bugged.
I respawned and fought it's final stage once more, model wasn't invisible anymore, but healthbar was still gone. Killed it with ease but still left me with a bitter taste.