Not blizz, and you gotta use eschuta. It's gotta be nova. Unless you preclear everything and only kill bosses— then it's fb/hydra or charged bolt. Fb/hydra is more DPS but it takes some time to set up the hydras, whereas charged bolt just gets in there and wrecks.
Blizz hits unreliably and takes longer than nova to clear mobs, but if you max telekinesis instead of frozen orb and use a staff cta with ES, and use wizzy + ormus + griffon + 1 soj, you will reach unbelievable levels of tanky (2.1k life, 2k mana- no blood mana curse).
For all 200 fcr rush builds, put at least 1 point into blaze and use it when coming back to a1/a2/a5 town from portal. Use horazon boots so you're not frozen from coldwurm. Skillers should have frw and enough fhr for 86 overall. Scs are frw/mana. Merc is always a prayer with cure, any armor (hustle, fort, coh, magic, gloom, treachery, stone, ...), and infinity (unless going blizz-> insight).
Also your rush char should never complete bird quest or larzuk, or else you'll need rushees present when killing mobs to get the rewards.
Thank you very much for your input.
I do have one question though. Since Nova and Charged Bolt use different synergies, which skills do you prioritize maxing first? Do you use Energy Shield and max it as well?