Going to get Fangskin:

Found or ID'd during the Fangskin battle:

It replaces a 10GF sc and a poison res sc.
Fangskin drops:

So that place is dangerous... I ALMOST had my first s/e moment, but persevered. Fangskin (or the other nearby unique) had Fanat aura, and was near the door. I got in a few licks, but was forced back to L1 to regroup. When I went back in I teleported over them only to land in the midst of a second unique snake group
I got hit a couple times, used a bunch of juvs, teleported away again and TPd. I then took the WP and ran back to the viper temple as the TP was too hot. Only one snake & Fang was still waiting by the door when I got back so I cleared them and the rest of level 2 much more cautiously. Phew...