Hunter ability · learned at level 10 · Nature

Serpent Sting Rank 2

Serpent StingRank 2

30 Mana35 yd range

Instant

Stings the target, causing 30 Nature damage over 15 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

Classic tooltip

Stings the target, causing 40 Nature damage over 15 sec. Only one Sting per Hunter can be active on any one target.

Data	Classic	Forever
effect 1 spell power coefficient	0.125	0
effect 1 value	8	6

What Blizzard said about Serpent 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
Matches the files
Rapid Recuperation: (New talent.) Prerequisite of Rapid Killing. Now grants Mana regeneration from Spirit while casting after hitting a target with Serpent Sting, and even more during Rapid Killing.
The files Rapid Recuperation (1223987), Marksmanship row 5, requires Rapid Killing. Serpent Sting hits grant 25/50% and consuming Rapid Killing 50/100% of mana regeneration while casting for 15 sec (tooltip).
Rapid Recuperation Rapid Killing Serpent Sting Class deep dives: Hunter and Druid

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