Lighting Warp and Ball Lightning not working on Zahmir, the Blade Sovereign boss

For some odd reason when you enter the boss' arena you cannot use Lightning Warp on Ball Lightning projectiles anymore. As soon as you cross the top of the last staircase it just stops working. If you go back it starts working again.

The bug occurs pass this point:

I confirm, it just happened here too

Same here. Luckily, boss deals so little damage I was able to kill it in about 45 minutes.

Really sucks when you encounter him as a deadly boss in maps. Still can't teleport on ball lightnings

Same for me , does not teleport on ball so no dps

its cause you are starting the zahir fight, just like in campaign. You have to walk to the edge of the platform to actually trigger his appearance and then the fight will continue as normal and you can attack. I had abyssal node in teh room so this made it difficult to clear.