Ring of see invisible
Wearing a ring of see invisible gives you see invisible, which lets you see creatures that are invisible.
Identification
Dropping this ring down a sink while not blind produces the message You see some air in the sink.
Putting on this ring while not having the intrinsic, but being invisible (via ring, potion or other means) produces the message Suddenly you are transparent, but there! This also auto identifies the ring.
Strategy
As invisible monsters are tricky to detect without other properties, this ring can be useful to tide you over until you can gain the property intrinsically. Wearing it constantly may not be necessary; just slip it on at first notice of a spellcaster turning invisible or assault by an unseen monster.
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