I note this comment from 9,0, after the level squish:
https://eu.forums.blizzard.com/en/wow/t/timewalking-pandaria-scenarios-level-requirement-to-high/205391
all end-game content is unlocked. With the exception of Scenarios, Hc Scenarios, and HC dungeons. These have level 50 requirements and I hope Blizzard could hear this plea to reduce the level cap to 35, alongside the other “endgame” Pandaria content.
So it seems the magic level is 50.
I don’t have a 50, but I tried a level 45, and confirmed 45 doesn’t do it whether in Chromie Time or not.
Some other random thoughts …
Running it on HC might help - maybe the boss has more HP? With 2 level 50s, and a higher level to get the kill.
What class has the weakest attack? I’m thinking something like Frost Nova, but I’m mage-centric My level 70 Mage shows that Frost Nova does just 123 damage when naked.
Ofc remove any auto-damage trinkets or talents.
Does the
count as damage? Or is there some other damaging Toy or object? One of those low-level Engineering bombs?
Would it work for the two other characters to put a heal - maybe a HoT? - on the character that is going to one-shot the boss? Healers get credit even if they don’t attack the boss directly.
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P.S. My 70 Mage, naked, hit the final boss on Normal with Frost Nova for 28,903, which didn’t kill him since his HP is 40K.