I made and maintained Diamond III with 5 days left in the season. I am proud of myself because that is the highest ranking I have ever made with level 4 summoners. This next season I'd like to try to get to diamond III or maybe even II. I think it may require some more upgrades like getting another daria to level 4 her and upgrade my manticore as well.
Here are my season rewards.
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From @golddeck