What Should I Do With My Dorcas

A good idea would be to use him...he's a good unit, especially with any -spd IV.

-spd is easily his best bane and +res is darn solid. He has basically a complete kit by default but if you wanted to go an extra mile, he appreciates Distant Def or a breath skill

With a res + superboon to 28 and - speed to 20, id make him a ranged tank with distance def seal with his DC weapon this way he can deal with mages easily and since he has decent res hes able to take on dragon units if you give him brazen def/res (A), res +3 (A), close defense (A) and quick reposte (B). His (C) skill is decent or it can be changed depending on your play style.

you got the ivs i wanted most on him, i'd give him warding breath, quick riposte, aether, close defense. C slot could be anything buffs, atk smoke and infantry pulse are good options