Looking at the Monster Manual, the Medusa Shroud of Zehir is a level 18 skirmisher but has an attack bonus of +15 vs. AC with its short sword. This is likely an error, as this is way too low for a level 18 creature and is the same bonus as a Medusa Archer, so it was probably repeated by mistake. However, I don't see any errata for this in the errata files.
Think it was meant to be +23, like the medusa's "Snaky Hair" power?
Think it was meant to be +23, like the medusa's "Snaky Hair" power?