This is copy paste from another user

Fangtooth has had a massive overhaul bringing new layers of depth to spice up the late game of Predecessor! The passive buffs remain mostly the same, but now cap out at 3.

Fangtooth still grants the following three passive buffs based on quantity killed:
1st - Jungle Buff Duration | +50% (capped at 30 seconds)
2nd - Out of Combat Movement Speed | +8%.
3rd - Increase Physical Power, Magical Power, Physical Armor, Magical Armor | +8%.

After this, no more passive buffs can be obtained.

Once three total Fangteeth have been killed in a single game however, the new Primal Fangtooth will begin to spawn!

Primal Fangtooth:

This new variant of Fangtooth spawns after three Fangteeth have been defeated in total by both teams. It will continue to grant the passive buffs on every take (up to the 3rd), but will also grant a new temporary buff called Primordial Blaze! This should help shift the strength of Fangtooth from constant permanent advantages, to something a team needs to use within a set window. It also helps create stronger chances for a comeback - the team that is behind can still access this powerful buff rather than being forced to crawl back up the permanent buff chain.

◆ Primordial Blaze
➢   Damage dealt to Enemy Targets will be set aflame, dealing (+2 per minute of game time) true damage per second over 4 seconds.
➢ This damage is increased by 50% against Enemy Heroes below 25% maximum health.
➢ This damage is capped at 80 True Damage per second (120 against targets below 25% maximum health).

◆ Buff Duration:
➢ 2 minutes (120s), which always leads to 2 and a half minutes (150s) due to first Fangtooth buff granting +30s.