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Offense Mastery Trees: Season 2011, Season 2012, Season 2013, Season 2014
Ferocity Mastery Tree: Season 2016


Offense Mastery Tree
(2013)
Summoner's Wrath: Exhaust lowers target's MR/Armor by 10; Ignite gives +5 AD/AP when on cooldown; Ghost now grants 35% movement speed; Garrison now grants 50% splash damage to allied towers.Fury: Grants 1 / 2 / 3 / 4 % attack speed.Sorcery: Grants 1 / 2 / 3 / 4 % cooldown reduction.Butcher: Basic attacks deal 2 / 4 bonus damage to minions and monsters.Deadliness: Grants 3 / 6 / 9 / 12 AD at level 18 (.17 AD per rank per level)Blast: Grants 4.5 / 9 / 13.5 / 18 AP at level 18 (.25 AP per rank per level)Destruction: Increases damage to turrets by 5 %.Havoc: Increases damage by 0.67 / 1.33 / 2 %.Weapon Expertise: Grants 8% armor pen.Arcane Knowledge: Grants 8% magic pen.Lethality: Grants 2.5 / 5 % critical strike damage (doubled on melee champions).Brute Force: Grants 1.5 / 3 attack damage.Mental Force: Grants 2 / 4 / 6 ability power.Spellsword: Your basic attacks deal bonus magic damage equal to 5% of your ability power.Frenzy: Grants 10% attack speed for 2 seconds after landing a critical strike.Sunder: Grants 2 / 3.5 / 5 armor pen.Archmage: Grants 1.25 / 2.5 / 3.75 / 5% increased ability power.Executioner: Increases damage by 5% against targets below 50% health (excluding true damage).Season 3 Offense
Other Mastery Trees:
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The Offense Mastery Tree was one of the three mastery branches. It was introduced with V1.0.0.152 (Preseason 2013) on 2012-12-04.

It would've taken 42 points to max out the Offense tree.

List of Masteries

Tier 1
Tier 2
(Requires 4 points)
Tier 3
(Requires 8 points)
Tier 4
(Requires 12 points)
Tier 5
(Requires 16 points)
Tier 6
(Requires 20 points)