Probably a seal from Tempest Trials. I'm glad because I do like some of the armor units, like Halloween Henry, but I don't like having to use them in an Armor Team for them to get the benefit of added mobility, which is the main reason I never liked Armor Emblem.
Granted it takes away an essential slot for the armors; for example, Zelgius' Steady Breath/Bold Fighter skill really make good use of the Quick Riposte seal. Regular Hector can probably make good use of it though since he can still run his Vantage set.
Pokemon GO
Fire Emblem Heroes
Fate Grand Order
Dragonball Legends
Dragalia Lost
IV Calc
Heroes