Evaluate my Arena Core!

Sheena should be ++spd for maxscore or -spd for max utility.She should also carry aether for a massive arena score boost.

Zelgius would ideally carry warding breath, bold fighter, and qr S slot to be a threat no matter what phase hes in, but thats nitpicking.

Effie should run something other than silver lance, berkuts lance is popular because it lets her tank magic very effectively, however reprisal lance is also nice. Trade death blow for something else, like sturdy blow if you really wanna use a blow skill, alternatively you could use an anti armor lance on her to deal with other armors.

I wouldn't go sacrificing your only W.Lissa.

I'm not sure of too much to suggest except adding more merges.
-Effie wants a different lance. Berkut's, slaying and brave are the usual picks. Probably not brave if she's providing the hone (but she has the boots. Hmm. I might play more passive and take Berkut's lance. Goes well with the superboon. Otherwise, slaying+res)
-I would give Effie either DC or a breath skill when you can.
-Look for a Sheena without atk bane. The ignis is great, but I think she can do some damage outside it, especially with hone armour.