Bear's Endurance, Mass

Transmutation
Level: Clr 6, Drd 6, Sor/Wiz 6
Components: V, S, DF
Casting Time: 1 standard action
Range: Close
Target: One creature/level, no two of which can be more than 30 ft. apart
Duration: 1 min./level
Saving Throw: Will negates (harmless)
Spell Resistance: Yes
Description

Other Information
Same as Bear's Endurance but affects multiple people. Minimum minutes duration/number of targets is 11 (12 for sorcerers).

Pros:

Provides actual increase in hit points (not temporary hit points).

Multiple bonuses: hit points, Fortitude saves, Constitution checks.

Cons:

The duration is awkward - it lasts longer than you need for a single fight, but not long enough that it can really be used except immediately prior to a fight.

Tricks/Combos:

Eberron: Useful for "healing" Warforged characters, since it's a Constitution bonus, not an actual healing spell.

Overall:
Probably the most generally useful of all the "animal buff" spells, since it's useful to any class, and it provides skill check and saving throw bonuses. Unlike the other animal buff spells, should be pre-cast to have the best effect. If cast in battle, the temporary boost in hit points is fairly minor, and an actual Cure Moderate Wounds spell will usually heal more hit points and more importantly, not go away once the duration ends. Also, it's unlikely every desired target will be within range during combat, where as pre-combat you can gather up and then cast. A very good pre-cast spell for any physical tank or frontline fighter.

Recommended for Clerics?
No. The extra hit points (minimum 22) is always useful, but the +2 Fortitude bonus, while useful, isn't spectacular by 11th level. It's an okay choice, but unless you actually have 11 or so targets that will benefit from this spell, there is likely other 6th level spells that are better. If you really need Bear's Endurance, use a wand or scrolls rather than waste a 6th-level spell slot.
Special: If you are a summoner and are summoning a large number of minions, then this spell could be very good.

Recommended for Druids?
No. The extra hit points (minimum 22) is always useful, but the +2 Fortitude bonus, while useful, isn't spectacular by 11th level. It's an okay choice, but unless you actually have 11 or so targets that will benefit from this spell, there is likely other 6th level spells that are better. If you really need Bear's Endurance, use a wand or scrolls rather than waste a 6th-level spell slot.
Special: If you are a summoner and are summoning a large number of minions, then this spell could be very good.

Recommended for Sorcerers?
No. Better spells available, and your limited spell selection means this spell just isn't good enough. If you really want it, take the lower level Bear's Endurance and cast it multiple times instead - that's why you have all the spell slots, after all.

Recommended for Wizards?
No. The extra hit points (minimum 22) is always useful, but the +2 Fortitude bonus, while useful, isn't spectacular by 11th level. It's an okay choice, but unless you actually have 11 or so targets that will benefit from this spell, there is likely other 6th level spells that are better. If you really need Bear's Endurance, use a wand or scrolls rather than waste a 6th-level spell slot.
Special: If you are a summoner and are summoning a large number of minions, then this spell could be very good.

Recommended as a scroll?
Not unless you know you will have 11 targets. A scroll of Mass Bear's Endurance is 1650, which is the same cost as 11 Bear's Endurance scrolls. If you only have ten targets, then you've wasted your money.