It's going to be retired anyway. I too hadn't finished it from last season and was initially mad until I remembered sun setting was a thing soon.
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People can still use it freely in most of the PVP gamemodes since there are no level advantages slapped on most of them. Sunset or not.
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The power cap on felwinters lie is 1310 meaning it will be good up until season 14 according to light.gg.