This build is ideal for survivability and defense when playing Dominion. The build depends largely on what enemies you are facing.

Through trial and error (playing the game), I have found that the typical "BUILD A TRINITY FORCE AND LIFESTEAL" approach to playing Trundle is less than effective in Dominion.

Trundle isn't an AD carry in my opinion, he just doesn't do enough damage. But Trundle is excellent at ganking and defending a tower. He is also very good at disabling other AD melee heroes. Which is what I generally see most summoners using.

So my answer to the Trinity Force + Lifesteal fail is to build Trundle defensively. His attack damage scales very well as he progresses through the game, so you are able to focus more on Defense and HP rather than DPS.

This makes Trundle an excellent initiator especially against AD melee, and great for defending capture points.

I will not be going into great detail, but I will do my best to outline the important parts of the build.

Pros:
-Flexibility based on your opponent
-Survivability early --> late game
-Late game life steal
-Excellent defensive capability
-Excellent initiation
-High HP
-High armor and magic resistance
-GREAT MOBILITY (That's Trundle for ya)
-GREAT CC AND MAP CONTROL (See above)

Cons:
-Low DPS

You can look at my Runes and Masteries above. I like armor penetration, cooldown reduction, health, and dodge for runes. And I basically, pick mostly defensive masteries.

I'm still playing around with these. I'm not sure what works best yet.

You should be taking Ghost ALWAYS. Your 2nd spell is up to you.

I switch between Flash, Rally, Exhaust, and Ignite; depending on mood and situation (i.e. Am I pushing bottom? If yes, then I'm probably going to take Rally to push harder).

You get the idea.

This is pretty simple, just max Q and R ASAP. (Rabid Bite and Agony)

Then I usually favor W (Contaminate) over E (Pillar of Filth), but I think this is quickly changing.

IMHO, Pillar > Contaminate. But, they're equally important, so I usually just split the difference and alternate.

The main thing anyone should pay attention to is what type of champions you are facing, or to put it simply, what type of damage you are taking. (Physical vs Magic Damage)

If they are largely AP champions you might want to consider getting the Force of Nature first. Conversely, if you are facing mostly AD heroes I suggest you get the Frozen Heart first.

Generally, I suggest you take the Mercury Treads; but like I said before, it largely depends on the champions you're facing, if they are all AD you may want to consider taking Ninja Tabi for the extra armor and dodge.

You can exchange the Frozen Heart with Thornmail, if you are facing all AD. But I favor the Frozen Heart on a mixed team.

The other important feature to note of this build is that I usually build the Force of Nature (magic defense) while I'm also building the Frozen Heart (armor), so that I'm not lacking magic defense, while I'm building my armor. But once again, it largely depends on what champions are on the field.

Once you get your boots, armor, magic resistance:
BOOTS
Ninja Tabi (Mostly AD Enemy Team)
Mercury Treads (Mostly AP or Mixed Enemy Team)
Armor
Frozen Heart (Mostly AP or Mixed Enemy Team)
Thornmail (Mostly AD Enemy Team)
Magic Resist
Force of Nature (ALWAYS) Note: If you're facing an all AD team and aren't taking any
magic damage you may want to skip this and get either
Thornmail or Frozen Heart. (Whatever you didn't build)

The next items are kind of up to you, and the items you should take largely depends on what enemy champions you face.

MIXED ENEMY TEAM - COMMON

Three core items: Merc Treads, Frozen Heart, and FoN, followed by Warmog's, Sanguine
Blade, and Atma's.

MOSTLY AD ENEMY TEAM - COMMON

You will want to pick up as much armor as you can (consider dropping FoN). So after I
pick up my core 3 items (Boots and 2 pieces of armor), I typically get more HP through
with Warmog's. Followed by Sanguine Blade (for lifesteal) and Atma's for more defense.

MOSTLY AP ENEMY TEAM - RARE

You will want to pick up as much magic resist as you can. So you will want to build
Mercury Treads, FoN, Spirits Visage, Wit's End, Warmog's, and a Sanguine Blade.

For an in depth look at how to use Trundle's skills please visit this guide:

Your All Purpose Guide to Trolling

By: WHITESLOL

It was immensely useful when I was learning to play Trundle.

In summary, these 3 different Trundle builds allow for:
-Flexibility based on your opponent
-Survivability early --> late game
-Late game life steal
-Excellent defensive capability
-Excellent initiation
-High HP
-High armor and magic resistance
-GREAT MOBILITY
-GREAT CC AND MAP CONTROL

I would have liked to include item links and skill links and a more in depth look at why and when I buy certain items. I will try to update in the future to make this guide a little more user friendly.

Thank you for reading and please comment and rate.