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First 5 star to 5/65 to help me get to Cavalier

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There is a reason why, back in the day everyone saved for blade and IF yours is duped (which it is?), definitely got for him. You have starky to go with him, Medusa at 4/55 is enough for the robot bosses and minis in act 6.1 and he will also make 100% each UC EQ easier.
But if you are amazing at this game and never use items, starky or Hyperion, with Hyperion duped, almost peerless if you don't run suicides.
Hyperion is that good... But blade may make it easier to get more materials at a faster, cheaper rate initially.
I think I did cavalier with R4s. Medusa is very helpful for the chapter with sentinel in there (I think that's 6.1?).
I have Hyp at r5 now and hes consistently been one of my top 3 mvp since.
Most importanly you need a good counter for XB!
It's so easy to get t5b now with glory, 1 a month in even a map 3 alliance is straightforward. T2a is possibly more of a bottleneck. So do whoever is going to make life easier while you get to grips with the game again and is the least forgiving. You'll be able to 5/65 another in 6-8 weeks anyway :-)
(There is an Ultron mini boss on 6.1.2 and sentinel on 6.1.6, that you WILL use that 4/55 Medusa for - you can do them with hype, but she just makes them easy)
Good luck!
I relied mostly on Iceman for Cavalier run especially with Crossbones