Everyone seems obsessed that you need a Titan for Skollas, to have bubble, but we do it with ANY class set up, Titan or no Titan, we just did one just now 3 x Warlocks, we killed him on 2nd try, we always kill him on 1st to 3rd try using this right hand side tactic we developed. Use whatever works for you best but, LFG and stuff is all obsessed with must be a Titan, but there's no need, just do it without no problemo.
Vid of our kill just now, no Titan: https://youtu.be/fvgEFs-NkOQ
Vid just showing us doing right hand tactic with various team setups: https://www.youtube.com/watch?v=Luy_Itvm8vA
Hope this helps xxx
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We did it yesterday with 2 warlocks and my hunter.