Small tip that might be worth trying for any group having trouble with Vosik, as we were: Try using only 3 dedicated bomb throwers in 2 rounds per bomb cycle, rather than 6 throwers at same time. This helped us with add clearance, and the moment we tried it we were dying far less, which is the name of the game. Cleared it with that strategy in 3-4 rounds vs an hour or more or wipes.
We were getting cleared by adds, and this helped us by having a dedicated add clearer on each side, and the timing was a bit easier for our group.
I'm running WotM for the first time ever tonight. Is there any gear that's essential for the raid?
The nice thing about this raid is you can use a lot of different loadouts and be effective. Swords and Horn are nice to have, as well as a good sniper (I use vendor Event Horizon), but there are plenty of good options.