@Muchacho good point, 5*s take forever, ugh!
on your Qs:
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Drop your other D-Droppers, Athena’s special overwrites theirs. source: 📑 Status Effects (Buffs and Ailments) and Stacks - Dead topic see link in post #190
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I am pretty sure you can get Reuben from an EHT, even from single EHTs. any pull in seasonal portal, whether 1x or 10x, gives you an HOTM bonus chance.
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Without knowing your roster super well (sorry!), I initially vote Glenda. Kiril and other 4* healers can step in for healing IMO, Glenda’s faster mana speed relative to Raffaele + cleanse + offensive buff are too good to pass up…