Aamon: Best build, Counters

Invisible Armor

Each time Aamon hits an enemy with a skill, he enters Camouflage, becoming untargetable, recovering HP equal to 25 (+15% Total Magic Power) (+ 3% of his Max HP) every 0.5s, and gaining 80% Movement Speed that rapidly decays over 3s.
Upon leaving the Camouflage state, Aamon immediately resets his Basic Attack's cooldown and enhances his Basic Attacks for 3s. Each enhanced Basic Attack deals 70 (+100% Total Physical Attack) (+115% Total Magic Power) Magic Damage. The first attack after manually leaving Camouflage instead deals 84 (+120% Total Physical Attack) (+138% Total Magic Power) damage and reduces all skill cooldowns by 1s.

Soul Shards

CD: 7 Mana Cost: 40

Passive: Aamon charges his armor through enhanced Basic Attacks or while camouflaged. At 5 charges, Aamon throws 6 shards at the target on his next attack, each shard dealing 50 (+15% Total Magic Power) Magic Damage. The shards will then scatter around the target.
Active: Aamon throws a shard at a nearby enemy, dealing 175 (+60% Total Magic Power) Magic Damage.

Slayer Shards

CD: 12.5 Mana Cost: 50

Aamon throws a shard forward, dealing 120 (+50% Total Magic Power) Magic Damage and slowing enemies hit by 50% for 2s. The shard returns to Aamon after a short delay, granting him the Camouflage state.
If the shard hits a non-minion enemy, it returns immediately.

Endless Shards

CD: 50 Mana Cost: 150

Aamon throws all shards at a designated enemy and slows them by 30% for 1.5s. After a short delay, the shards will fly to the enemy's location again, each dealing 35 (+10% Total Magic Power)-70 (+20% Total Magic Power) Magic Damage.
The number of shards increases with Aamon's armor charges and the shards on the ground (8-25).
The damage dealt increases with the target's lost HP, to the max when the target's HP is below 30%.