Do you have any purple 5* maxed? Or any 4* at +20? Just wanna know if you have other options to choose from, or if this is the gist of it.
& Am I right in assuming you guys are running blue tanks for war, therefore you must make either Richard or Arthur your tank?
If I’m correct, then with the info provided, I’d suggest:
Richard would make a better tank than Arthur, but aside from defense, embleming Richard just wouldn’t be as effective and/or versatile as embleming either an amazing titan and raid support hero (Arthur) or embleming a super-star tank that’s got a little of everything (Telluria). So unless you value your war defense above all else, I’d be focusing on one of the others – and seeing as you’re running ice tanks in war anyway, Arthur looks to be your best bet [for that] if you want versatility. That way, you don’t need to reset your emblems, you’ve got someone strong to use as your ice war tank, and you can still bring him with, and make use out of him, on offensive battles like titans and raids – due to the elemental defense down.
So that means that what you have set as your current war defense team is probably your best option [given that info].
As for regular defense, think Telluria is your best option for tank, but seeing as your emblems are already on Arthur - you have two options.
You could strip Arthur, give all of your emblems to Telluria, and suffer in war moreso lacking a strong ice tank.
You could split the emblems, and give all newly received emblems to Telluria without touching the emblems still on Arthur. That saves you a reset token, and allows you to have two pretty strong defensive heroes rather than just one super strong one. (Preferred option)
If you do this, with the heroes you have, this is what I’d suggest for regular defense:
Poseidon-Santa-Telluria-Neith-Arthur (assuming Richard never goes to 80, or never sees emblems, therefore not as helpful placed on defense)
Not great, as I prefer full rainbow teams, with only very fast (or fast) heroes in the wings - but given what’s shown, think those are your best bets.