Now that we know the Zentragt Horn is safe to continue using, that's a fairly powerful tool to have in our bag of tricks. Not only is the transformation a really good combat enhancement for many situations, it also comes with a few really nice SLAs.
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If we used the horn on someone, they could then turn around and cast Bear's Endurance on themselves and a couple other people. +4 Constitution equals +2 HP per level or HD and a +2 bonus to Fortitude saves.
They could use CLW to help with healing, too, allowing Inge to conserve her spell slots.
The Rage SLA isn't as powerful as the Barbarian ability, but it's not bad at all. At 6th caster level, the Zentragt person could affect two willing targets with Rage for at least 6 rounds. If those same two targets also got the Bear's Endurance buffs, they would be fighting with a +6 CON and +2 STR bonus.