Okay, so this rabbi either is an actual angel, or can take the form of one, or it is even a clever illusion. Brilliant planar scholar that you are, he is hard to quanitfy at first, but it finally dawns on you ... this is a
chalkydri, a type of good outsider that is a subrace of true angel. It was difficult to hone in, though, because when you learned about the chalkydri, they were always depicted as human men with fiery longswords. This is a dwarven form, but considering his holy symbol is that of Moradin - the Dwarffather - that is not surprising. He has a warhammer at his side (not fiery, or at least not right now.
Now, as a race, other than special examples, angels are extraplanar outsiders. Unlike the other primary good outsiders (archons, aza'ata, and agathions), angels can be found among all of the Upper Planes (though Elysium is most common, the plane of neutral good). Angels have both darkvision and low-light vision. They are immune to acid, cold, and petrification. They have moderate resistance to electricity and fire, as well as siginificant resistance against poison. Angels also possess the ability that most Upper Planar folk do ... something called "truespeech" which allows them to communicate with any creature that has a language, as though using a
tongues spell.
This nimbus that he possesses - the thing that tells you (once you sadly realize your
invisibility is no longer any good) is an extremely powerful protective aura that acts as a double-strength
magic circle against good - at double radius (20') - while combining it with the power of a
lesser globe of invulnerability (please read that link). Your
invisibility is not dispelled, but it is merely suppressed. If you leave the radius of his nimbus, it will continue operating as long as the spell has duration remaining (suppression does not halt spell duration). This means that if he has his nimbus running, only your three most powerful psychic spells have any chance of working.
Of course, angels are still outsiders, so that means he can take some punishment, is a canny warrior, probably has a quick body and powerful mind, is quite skillful, is well-versed in many weapons, and does not need to eat, drink, or sleep (but does need to breathe).
In particular among the angels, chalkydri are extremely militaristic and competent warriors, on par with the planar travelers known as movanic devas.