Boldtusk
Boldtusk is nice in flank, or corner.
Poseidon, Boldtusk, Yuman, Kageburado, Alasie would be my choice.
Alasie is better as a flank than corner but Kageburado is MUCH better as flank than corner.
Boldtusk 4*+18
Boldtusk at 4*+18 is a very nice red. And 4*+18 are 1/3 the emblems of 5*+18.
Proteus 4*+18
I would bring Proteus to 4*+18, Proteus is awesome against triple bosses.
I use him at 4*+15 for my low Platinum defense center.
Rigard 4*+18
I would bring Rigard to 4*+18 since different color than Ariel.
But I prefer color stacking, team synergy and broad roster over so I emblemed one of each class to 4*+18 first ( use emblems to get more emblems and 4* ascension items ).
Notes
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Quotes
Sturdy
Diamond defense
Fighter Boldtusk
Link
History
([History, quotes] Boldtusk the Ex Demigod or nerfing defense teams or complicated hero interactions)
FIN