Dorinthea, Quicksilver Prodigy

Dorinthea’s first ability refers to Dawnblade, Resplendent. It will not apply to just “Dawnblade” as it does not have the full name of “Dawnblade, Resplendent”.

Dorinthea’s first ability triggers the first time Dawnblade, Resplendent’s attacks get go again, increasing the number of times you can attack with that same Dawnblade, Resplendent. This is in addition to effects that also add to this limit (e.g. Twinning Blade) or any effects that set the activation limit (e.g. Flurry)

Dorinthea’s first ability refers to when go again is successfully applied to Dawnblade, Resplendent’s attack. For example, Dawnblade, Resplendent gets go again from Warriors Valor if it hits.

If your Dawnblade, Resplendent attack gets go again, then loses go again (e.g. Blizzard), you will still be able to attack with your Dawnblade, Resplendent an additional time.