Really really hawk those elemental DoT's, guys. They're Con's best bet
So I needed a shellsplitter and venerer's bracers, but was dreading fighting the crab because I've heard the fight takes forever solo.
It has about 30,000 hp.
I stacked all 6 elemental DoT II's on him with shockspikes to see if I could just bleed him in between cures.
He died in 3 and a half minutes using no other damage. 30,000 HP in 3.5 minutes, simply with DoT's.
It's pretty MP-heavy and a little...inglorious...but I don't think any other job can really take it down that quickly.
That ability to take that much life is probably why the elemental DoT's take so much MP, not that they really increase spike damage from nukes.
Anyway, this is probably Con's best bet, and much better than hitting uraeus for humiliating nuke damage.