Artoomis said:"Mind Shielding: This ring is usually of fine workmanship and wrought from heavy gold. The wearer is continually immune to detect thoughts, discern lies, and any attempt to magically discern her alignment.
Faint abjuration; CL 3rd; Forge Ring, nondetection; Price 8,000 gp."
Okay, so definitely no detection of alignment. If the Succubus had only recently put the ring on (1d6 x 10 minutes or less), a lingering dim aura would be detected, but with no way to link that to the Succubus.
All this is assuming that you agree that detecting "evil aura" is essentially a subset of detecting alignment, which I think is indeed the case, especially as the related Detect Spells are:
Detect Chaos
Detect Good
Detect Law
I suppose you could make the case that this is not actually detecting the alignment, but only on aspect of the alignment, but that seems to me to really be splitting hairs.
Undetectable alignment specifically says "from all forms of divination." And I'm pretty sure the "unamed" spell in the SRD ring of mind sheilding's description should (as in actually is) undetectable alignment.
Edit: Oh, I see. In the SRD they state "nondectection" as the generating spell. I'm about 90% sure in the DMG it states otherwise. I'm pretty sure it's a copy/paste mistake...
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