No one has mentioned HF with Vere aftermath? I would think that would parse rather well up there including Impetus. BLU will run out of MP in 1 minute and have to just sit and swing their swords... Being a career rdm, idk how Chainspell would parse. You get like 8~12 Blizzard IV's in a 1 minute span and you're sorta just done.
RDM is the premature ejaculation job in Vana'diel =/ It's alot of build-up for a 1 minute show.
Edit: Are we assuming the thing will attack us back....or are we going with it's a wall with inf. HP, who can knock the most of it down?