Udyr is tanky melee dps champion and one of the best junglers in League of Legends.

Armor Seals - Jungling


Magic resist per level - Late game


Movement speed Quintessences - Late game and faster jungling


Attack speed marks - Jungling and fighting

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Monkey's Agility

(Innate): Udyr's attack speed is increased by 10% for 5 seconds each time he switches stances. This effect can stack up to 3 times. Switching stances sets off a 1.0 second global cooldown.

Tiger Stance

(Stance) – Activation: Udyr's next attack will deal his current attack damage in addition to magic damage over 2 seconds. In addition, Udyr gains an attack speed buff for 5 seconds. This stacks additively with his persistent attack speed bonus.
Persistent effect: Udyr's attack speed is increased.
Cooldown: 6 seconds.

Turtle Stance

(Stance) – Activation: Udyr gains a shield that absorbs damage for 5 seconds or until it has absorbed the full amount of damage.
Persistent effect: Udyr's attacks cannot crit, but they restore a percentage of his damage as health and mana.
Cooldown: 6 seconds

Bear Stance

(Stance) – Activation: Udyr gains increased movement speed for a few seconds.
Persistent effect: Udyr mauls his enemies with such force that they are stunned for 1 second when they are hit. This effect can only occur once every 6 seconds on the same target.
Cooldown: 6 seconds

Phoenix Stance

(Stance) – Activation: Udyr sends out pulsing waves of fire dealing magic damage each second to nearby enemies for 5 seconds. During this time Udyr's ability power and attack damage are increased.
Persistent effect: Every third attack, Udyr engulfs the enemies in front of him in flames, dealing magic damage.
Cooldown: 6 seconds
Flame range: 625
Wave radius: ~500

This is how your build should look like in the end:

Tiger

Phoenix

+ Fast and potential jungler
+ Alot of ganking potential with Bear Stance
+ Gains alot of attack speed by switching stances

- Not good ganker without boots
- Usually focused if not tanky
- Hard to master

Farming in early game is last hitting with Tiger Stance. Late game you can farm really well with Udyr's ultimate - Phoenix Stance.

9-12-9 Is really balanced mastery build. Udyr gets armor penetration, some defense, movement speed and some more time for the buffs.