Hello im Sebek and i will try to show you my Udyr. So let's start.

PROS

-One of the best junglers
-hard to kill
-"speedy" boy
-nice dmg

CONS

-can't nuke
-need a lot of gold

Greater Mark of Desolation Greater Quintessence of Desolation

So why those runes? Greater Mark of Desolation and Greater Quintessence of Desolation will help you in gang and a little bit in jungle. Greater Seal of Evasion works great with Bridge Between

CORE ITEMS

You will need this items in evry game. Trinity Force works with evry stance change. We do it
many times. Madred's Bloodrazor its just great item for Udyr. You recovery HP and MP in Iron Mantle. And Black Cleaver give you some AD and attack speed. We need it also.

Boots

So there are many options for Udyr. Usually i buy Ninja Tabi but Berserker's Greaves and Mercury's Treads are good.

The Best:

Ghost- For speedy boy i just love it
Smite - For jungling ofc

Good:

Teleport - You can move quickly to someone who need you
Cleanse - Sometimes can be usfull
Exhaust - Good if you know that u will fight against strong autoattackers or ranged

Well evryone have his own system. This is my;

GOLEMS --> WARTHS --> WOLFS --> BASE --> GOLEMS --> WARTHS --> BLUE --> WOLFS --> RED -->DRAGON (with help)

Its my first bulid so comment and vote !