Forgot to mention, although it's not mentioned in the ability description Mekkatorque's second to to last ability removes buffs so make sure to use your defensive buffs afterwards at 29 seconds.
For lightning in thunderbolt, Hirvolm looks like he'll deal a good amount of damage on his ult if you have Shai'nachtan to activate it. We start this boss tomorrow, so I am going to try Shai'natchan and Hirvolm on a team. Hirvolm will get 15% attack up from Shai, then grants himself 20% attack on ult, then with Electrocuted on the adds, he'll deal 850% dmg and trigger a thunderbolt. Only problem is he can only hit 5 of the mobs with his ult, but on the plus side his battleskill is also AoE. In theory he should do quite good damage.
Worked ok. I don't have witches remains and the team was doing just over 100M dmg. I think out of the 6 teams I had it was #5, and don't think I had any other options that I could've replaced it with.
Are you worried about having a certain amount of health? I keep seeing we want to have at least 45k health on our guys so I am having to do like HP runes on the second slot but you seem to have certain characters even below 40k or is it dependent on team composition?