+180hp stacks with pretty much everything is SO NICE. basically a 360hp mask (tho does take up spell slot so not as good for MTS?) for those who can afford the spell slot. My mask of choice after I grab a songblade :)
With the OoW and DoN AA's for more buff slots this is no longer much of a problem. I have 4 extra buff slots atm and even with attack buffs I never fill up, but I will click the attack buffs so I have room for AE heals when there is an AE dot.
I'm looking at those blocks and it sure seems that if it's going to give 180hps then the <9 in slot3 and the <181 in slot2 should be switched yes? I can't imagine any ac buff giving you 180ac.
Also, if it gives you fire elemental illusion does it also give the 17ds with it that the enchi version does?
No: Form of Endurance says, "2: Stacking: Block new spell if slot 10 is effect 'AC' and < 181" and Form of Defense says, "10: Increase AC by 54" -- Slot 10 on Form of Defense has AC less than 181, which Form of Endurance restricts