What stats does Kraken's Fury give?

Kraken's Fury grants 10 AD and +10% AS.

What is the recipe for Kraken's Fury in TFT?

Kraken's Fury is built from Negatron Cloak and Recurve Bow.

Attacks grant 3.5% stacking Attack Damage, up to 15 attacks.

completed

Attacks grant 3.5% stacking Attack Damage, up to 15 attacks. After 15 attacks, gain 15% Attack Speed.

Attack Speed

Bonus Attack Speed makes a unit attack more often per second, which means more auto-attack damage and faster mana generation toward the next ability cast. Some carries scale beyond that — their ability itself fires more hits when they have more Attack Speed (e.g., Bel'Veth's slash count, Jinx's rocket count). Stacking AS items and traits on these units compounds: faster autos, faster casts, and bigger casts.
Stacking In Combat

The carrier ramps power within a single round — Titan's Resolve gains AD/AP per attack or hit taken, and Samira builds toward The Groove on knock-ups. All in-combat stacks reset when the round ends, unlike takedown-stacking which carries across rounds.