Dorinthea is a hero that focuses heavily on her weapon as a means to end the game. Weapons stay in the arena for the entire game, moving to combat chain when they attack and back to weapon zone when the combat ends.
Typically weapons can only attack once per turn, but as Dorinthea a prodigy swordsman, you can get around this with her hero ability. Dorinthea’s game plan is very much about trying to attack twice in the same turn with Dawnblade, which grows in power when it hits two or more times in a turn. To be able to attack an additional time, you need Dawn Blade to hit and you need to give Dawnblade go again with effects from your other cards.
There are many cards that can give Dawnblade go again, coupled with her hero ability, swinging twice in a turn should be easy work.