
Passive
Bridge Between
Udyr has four basic Abilities that swap between Stances and can Recast an Ability to renew it with Ultimate benefits. Additionally, after using an Ability, Udyr's next two Attacks gain Attack Speed.

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Riot Data Dragon 16.20.1. Base values before items, runes and bonuses; independent of match-data filters.
Base-game reference only. Mode-specific balance changes and augments are not included.
Official short descriptions · Data Dragon 16.20.1
Base-game reference only. Item, rune and mode-specific adjustments are not included.
This reference covers the passive and four ability slots. Alternate forms and full damage calculations are not covered.

Passive
Udyr has four basic Abilities that swap between Stances and can Recast an Ability to renew it with Ultimate benefits. Additionally, after using an Ability, Udyr's next two Attacks gain Attack Speed.

Q
Udyr gains attack speed and his next two attacks deal bonus physical damage. Recast: Gain even more attack speed, and the next two attacks call lightning to strike the target.
Base values from ability rank 1 upward.

W
Udyr gains a shield and his next two attacks heal him. Recast: Gain an even bigger shield and heal based on max health over the next couple seconds.
Base values from ability rank 1 upward.

E
Udyr gains movement speed and his first attack against each target will Stun them. Recast: Gain even more movement speed and immunity to immobilizing effects for a couple seconds.
Base values from ability rank 1 upward.

R
Udyr surrounds himself in a glacial storm, damaging and slowing nearby enemies. Recast: Empower and unleash the storm, causing it to track enemies and deal additional damage.
Base values from ability rank 1 upward.