Talon would be the best option but there's no way this is a good idea... Melee I'm pretty such is a huge chunk of your damage, you don't want to be doing that with a dagger.
I guess it ever so very VERY slightly optimal if you are going for a setup 1 shot on FC alongside a rogue. Since lava lash is your actual burst damage and you wanna hit as hard as possible simultaneously. After that go straight back to 2x maces though.