You can start it and make some progress in it. There's no real point in pushing towards the finish in RTTL till you are actually prepared and want to give LoL a try. I.E. i`m midway in chapter 4 and i've been there for at least a year now, but I can't be bothered with it, since I won't really try the Labyrinth anytime soon.
My bad, i read it as realm of legends at first instead of rrtl, tbh you still should be able to make it through, when i completed it it was with a r2 5* Psylocke, 4/40 Blade 4/40 Venom, r2 Thing, and an unduped 4/40 voodoo, the hardest part i remember was thorns and not have a reliable ability accuracy reduction champ. You have good enough champs to make though, just try and go as far as you can get without potions and if it feels fairly doable go for the rest
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There's no real point in pushing towards the finish in RTTL till you are actually prepared and want to give LoL a try.
I.E. i`m midway in chapter 4 and i've been there for at least a year now, but I can't be bothered with it, since I won't really try the Labyrinth anytime soon.