Hunter ability · learned at level 36 · Nature

Viper Sting Rank 1

Viper StingRank 1

135 Mana35 yd range

Instant15 sec cooldown

Stings the target, draining 616 mana over 8 sec. Only one Sting per Hunter can be active on any one target.

Game files · build 1.60.1.70245Read from the WoW Forever beta client, build 1.60.1.70245.

Compared with Classic

Data	Classic	Forever
cooldown	none	15 sec

What Blizzard said about Viper Sting, each line checked against the files.

Matches the files
Improved Stings: Formerly Improved Serpent Sting. Moved from row 4 up to row 2. Larger increase to Serpent Sting damage, and now also shortens the cooldown of Viper Sting and increases the duration of Scorpid Sting.
The files Improved Stings (1310661) is in Marksmanship row 2; Classic's Improved Serpent Sting was row 4. It gives +6/13/20% Serpent Sting damage (Classic 2-10%), -2/4/6 sec on Viper Sting's cooldown and +15/30/45 sec on Scorpid Sting (tooltip and talent curves).
Improved Stings Improved Serpent Sting Serpent Sting Viper Sting Scorpid Sting Class deep dives: Hunter and Druid

69876 Sep 16First beta build we archived. No changes in the client files since.