Amulet of Set

A powerfull item granting power of Set its wearer
An intelligent item, it shares power with the wearer
Increases in power with wearer, lol 1 to 4, 5 to 8, 9 to 12 and 13 to 20
Gets fangs at 5th level, changes in language and sounds with shhhhh sounds
Fangs do 1d4 +3 plus 2d6 poison
At 9th level you see visions of Kushka home of the Yuanti and start speading the word, starting to transform..., you also get advantage vs poison, Learn to create poisons to relax and charm people
+1  to savjng throws and AC for each 5 lives, +1  to dex roles stealth 
You start to learn and understand the language and culture of the Yuat ti
Also at 9th level,
At will animal friendship with snakes 3 x day poison spray 3x suggestion 1 x fear per day
13th level
Immune to poison Can change into medium snake Also going cold blooded, so slower in cold, faster in heat, shed scales and skin...