Rammus

Jungle

Ok.

Maximum tank and target acquisition.

Resolve

Durability and crowd control

Aftershock

After immobilizing an enemy champion gain defenses and later deal a burst of adaptive damage around you.
Bone Plating

After taking damage from an enemy champion, the next 3 spells or attacks you receive deal less damage.
Conditioning

After 10 minutes gain 8 Armor and 8 Magic Resist and increase your total Armor and Magic Resist by 5%.
Unflinching

Increase your Tenacity and Slow Resistance for each summoner spell on cooldown. Immediately after casting a Summoner Spell, gain a larger burst of Tenacity and Slow Resistance for a moderate duration.

Domination

15-135 health (at levels 1-18) and +9 AP or +5.4 AD, adaptive

Cheap Shot

Deals bonus true damage to enemies with impaired movement or actions.
Relentless Hunter

Unique champion takedowns grant permanent out of combat MS.

WhyAftershock

Rammus is all about engaging with the CC of his [Q] and [E] and the taunt should last long enough to keep your target in the explosion radius.

WhyBone Plating

Bone Plating makes you extra durable in those early game ganks allowing you to go toe-to-toe with any apposing duo in a 2v2.

WhyConditioning

Rammus benefits massively from both Armor and Magic resist, scaling his [W] to make him an unkillable machine.

WhyUnflinching

Rammus' biggest counters are CC and slows applied to him while rolling in. Unflinching allows you sure up some of those weaknesses.

WhyCheap Shot

Rammus' ability to repeatedly Slow/CC enemy champions with [Q], [E], and [R] allows him to proc bonus Cheap Shot True Damage in nearly every skirmish several times, granting you the extra bit of damage for any kill.

WhyRelentless Hunter

Relentless Hunter's stacking Movement Speed combined with your [Q] allows you to get to any fight or skirmish on the map at the drop of a hat.