Hard to say,

I have only run into one situation so far where I was low or out of MP. I was doing a Boss Mob Fate in Castrum area and there were only 6 of us doing it. But other than that,no normal dungeon so far has brought me further than 3/4ths down. And I've done Hullbreaker, Sohr Kai, and Sirensong Sea.

Usually because you're only clearing Trash mobs up to that point I've rarely used melee on them. Usually just a lot of scatter and then standard Jolt + VerAero/VerThunder on the last one that goes down because its really low.

So I've usually got my full melee attack series for the Boss mob.... and its my opener.

I'll lead off with that... Corps-a-corps>Riposte>Zwerchhau> Redoublement>Embolden>Displacement

So I'll drop my Embolden on the melees as I back outside of Melee Range at that point, and doing my standard Dual Casting Jolt +VerSpells, building up my guage again.

And just as a practical matter, Embolden is rarely ready before my next melee attack series is ready to go anyway. But I suppose you could force one early using Manafication.