Mastery
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A Mastery is an area that a summoner is able to focus their intense magical training into, categorized into three specific categories, which are collectively known as masteries. Some of the more advanced masteries require not only a working knowledge of previous masteries within a single category, but also the knowledge of a specific mastery. As a summoner gains levels of power within the League of Legends, they are able to select which specific areas of interest to focus on.
Summoner masteries are not set in stone; based on the type of champion you wish to control in a battle arena, masteries can be changed to better suit a summoner's needs, simply by pressing the "Return Points" button to completely reset your masteries and allow yourself to choose others in which to spend your points ("re-spec").
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Trees 
Edit
There are three types of trees that your summoner can develop in:
Mastery pages Edit
Mastery pages were released in patch V1.0.0.118b. Mastery pages can be stored and, later, chosen similar to Rune pages during champion selection. You can have up to 20 Mastery Pages.
Attainment Edit
With each level achieved by a Summoner, the Summoner also receives one mastery point, capped at 30 mastery points, the maximum summoner level. Each mastery takes one point to increase its level and each tree contains at least 37 points worth of masteries, so even at top level the Summoner is not able to completely fill any one tree, let alone all trees. This adds a strategic element to your selection of Summoner masteries, as you can choose masteries that synergize with your champion, spells, and teammates.
It is important to note that most masteries require points in the tree. When moving to higher levels in the tree (higher "tiers"), one will encounter an increasing prerequisite of a 4 points spent in that tree. For example, in order to put points into Alacrity (a tier-2 offense mastery), one must first put a total of 4 points into any of the tier-1 offense masteries, and to put a point into Juggernaut (the tier-6 defense skill), one must have 20 points in other defense masteries. A summoner must have at least 21 points (so level 21) to acquire the last mastery in a tree. The last mastery is usually the most useful and vital to that particular mastery tree.
Some masteries require another mastery to be earned before a higher tier mastery is available. This more direct type of prerequisite is shown by the grey lines that sometimes lead from one mastery to another higher-tiered mastery. >These connected masteries usually correlate in some way. The lines denote the fact that all ranks of the lower tier mastery must fully acquired ("maxed out") before the higher tier mastery will become available.
Patch history Edit
- Masteries have been reworked.
- All Mastery Pages have been reset.
- You can find full details on the new masteries on the Pre-Season 3 website.
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Improved Recall no longer causes the 
Recall sound to keep playing after the player cancels the spell.
- Mastery Pages will now be stored server-side so they can be accessed from any computer.
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Deadliness: Changed to 0.5 attack damage per level (9 attack damage at champion level 18) at 4 points from 4% critical strike chance.
- Alacrity attack speed reduced to 1/2/3/4% from 1.5/3/4.5/6%.
- Summoner's Resolve - Improved Heal reduced to 10% from 15%.
- Perseverance removed, replaced with Strength of Spirit - increases health regen per 5 seconds by 0.4/0.7/1% of maximum mana.
- Masteries have been remade.
- Improved Summoner Spells are now condensed into 3 masteries, each at the first tier of their respective trees.
- Summoner's Wrath improves Offense tree Summoner Spells.
- Summoner's Resolve improves Defense tree Summoner Spells.
- Summoner's Insight improves Utility tree Summoner Spells.
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- Havoc mastery changed to increase total physical and magic damage dealt by 4% from increasing base physical and magic damage by 5%.
- Fixed a bug where Strength of Spirit didn't include mana gained from buffs (for example Ryze's bonus mana from Desperate Power or Tear of the Goddess).
- Strength of Spirit: Mana to health regeneration conversion reduced by about 33% and clarified the tooltip to show that it was regeneration per 5 seconds.
- Meditation: Mana regeneration per 5 seconds reduced to 1/2/3 from 1.66/3.33/5.
- Veteran's Scars: Health reduced to 12/24/36/48 from 15/30/45/60.
- Ardor:
- Now provides all of its benefit at rank 1 rather than half at rank 1 and the other half scaling up to level 18.
- Fixed bugs where Ardor was not counting ability power and attack speed from many sources; essentially anything that wasn't an item.
- Fixed a bug where Ardor and Rabadon's Deathcap were double multiplicative.
- Clarified the tooltip.
- Fixed a bug with Rank 2 of Utility Mastery where it was not working properly.
- Fixed a bug where Tenacity caused Cho'Gath's Feast to not kill the target.
- Burning Embers: No longer gives a placeholder buff while active.
- Cripple: Armor and magic penetration lowered to 10 from 25.
- Improved Rally: Now gives 20-70 ability power, depending on level, instead of a 20% increase to base magic damage dealt.
- Fixed a bug that caused Utility Mastery to not work properly.
- REMOVED: Demolisher
- Willpower: Cooldown reduction on Cleanse reduced to 20 from 30.
- Mystical Vision: Now properly adjusts Clairvoyance's cooldown.
- Willpower: No longer affects Cleanse's cooldown.
- Mender's Faith: Changed to 30 second cooldown reduction on Heal from +10 × level bonus healed HP.
- Mender's Faith: Now provides 10 × level bonus health on Heal from a flat bonus 75 health. Additionally reduces the cooldown by 10 seconds.
- Preservation:
- Cooldown reduction on Revive increased to 30 from 20.
- Bonus health duration increased to 120 from 90.
- Cooldown reduction on
- Mystical Vision: Vision duration bonus on Clairvoyance increased to 4 from 3.
- NEW Mastery: Burning Embers - While Ignite is on cooldown, your champion gains an additional 10 ability power.
- NEW Mastery: Insight - Clarity restores 100% of mana to allies.
- Mystical Vision: Clairvoyance duration bonus increased to 3 seconds from 2.
- Mystical Vision: Now increases Clairvoyance duration by 2 seconds and reduces its cooldown by 5.
- Willpower: Now correctly refers to Cleanse instead of Boost.
- Greed: Fixed a bug causing it to not work on some champions.
- Reinforce: Damage boost to minions increased to +9 from +6.
- Harden Skin: Damage reduction now calculated before armor.
- Nimbleness: Fixed a missing buff.
- Offense Tree
- Deadliness - Increases critical strike chance by 0.66% per rank.
- Cripple - Reduces armor and magic resistance by 25 on targets affected by your Exhaustm and increases its duration by 5 seconds.
- Plentiful Bounty - Increases the gold granted by Smite by 5, and reduces the cooldown by 5 seconds.
- Archmage's Savvy - Increases the caster's ability power by 0.2/0.4/0.6 per level.
- Sorcery - Reduces ability cooldowns by 0.75% per rank.
- Alacrity - Increases attack speed by 1% per rank.
- Archaic Knowledge - Grants 15% magic penetration.
- Sunder - Physical attacks ignore 2 armor per rank.
- Offensive Mastery - Increases damage to minions and monsters by 2 per rank.
- Brute Force - Increases physical damage dealt by 1 per rank.
- Master Taunter ( Demolisher) - Increases the armor of a promoted minion by 20, and reduces Promote's cooldown by 15 seconds.
- Lethality - Increases critical strike damage by 3.33% per rank.
- Improved Rally - Increases Rally's duration by 5 seconds. Improved Rally also increases armor and magic damage of affected allies.
- Havoc - Increases damage dealt by 5%.
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- Defense Tree
- Mender's Faith - Increases the amount healed from Heal by 75, and reduces its cooldown by 10 seconds.
- Resistance - Increases magic resistance by 2 per rank.
- Preservation - Reduces Revive's cooldown by 20 seconds, and upon resurrection, the revived player has their health increased by 400 temporarily.
- Hardiness - Increases armor by 2 per rank.
- Strength of Spirit - Increases health regeneration by 0.1/0.2/0.3% of your maximum mana.
- Evasion - Increases dodge chance by 0.5% per rank.
- Defensive Mastery - Reduces damage from minions and monsters by 1 per rank.
- Nimbleness - On a successful dodge, your movement speed is increased by 10% for 5 seconds.
- Harden Skin - Reduces damage received by 1 per rank.
- Veteran's Scars - Increases health by 15 per rank.
- Willpower - Increases the duration of Boost by 2 seconds, and reduces its cooldown by 30 second.
- Ardor - Increases attack speed and ability power by 0.66% per rank, and an additional 0.66% at level 18. which increases as your champion levels, per rank. (i.e. 2%->4% with 3 ranks)
- Reinforce - While Fortify is off cooldown, increases damage to minions and monsters by 6. In addition, increases the armor of turrets by 10 seconds after the invulnerability fades.
- Tenacity - Reduces damage received by 5%.
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- Utility Tree
- Spatial Accuracy - Reduces Teleport's cast time by 0.5 seconds, and reduces its cooldown by 5 seconds.
- Good Hands - Reduces time spent dead by 3.33% per rank.
- Perseverance - Increases health and mana regeneration by 2% per rank.
- Haste - Increases Ghost's movement speed bonus by 8%, and increases the duration by 1.5 seconds.
- Awareness - Increases experience gained by 1.25% per rank.
- Expanded Mind - Increases your maximum mana pool by 1.25% per rank.
- Greed - Grants 1 gold every 10 seconds for the game.
- Meditation - Grants .33/.66/1 mana regeneration per second.
- Utility Mastery - Increases the duration of buffs from monsters by 15% per rank.
- Quickness - Increases movement speed by 1% per rank.
- Blink of an Eye - Reduces Flash's cooldown by 15 seconds.
- Intelligence - Reduces cooldowns by 2% per rank.
- Mystical Vision - Increases the duration of Clairvoyance by 15 seconds. In addition, the first 15 seconds of Clairvoyance grant stealth detection.
- Presence of the Master - Reduces summoner ability cooldowns by 15%.
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- Other
- Expanded Mind and Intelligence are no longer linked.
- Hardiness, Brute Force, and Meditation have one less rank.
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- Perseverance: Health/mana regeneration reduced to 4/8/12% from 5/10/15%.
- Good Hands: Death duration reduction reduced to 5/10/15% from 7/14/21%
- Awareness: Bonus experience awarded reduced to +4/6/8/10% from +4/8/12/16%.
- Spatial Accuracy: Cast time reduction on Teleport reduced to 0.5 from 1.
- Plentiful Bounty: Bonus gold from Smite reduced to 5 from 10.
- Mender's Faith: Increases Heal by 75 instead of 100.
- Preservation: Duration of health bonus increased to 2 minutes from 90 seconds.
- Summoner talents now work.
- Fixed an issue where it appeared that you could edit the talents of other summoners when viewing their talent trees.
- Fixed a bug that caused players to lose talent points.
- Fixed a bug where Summoner Tree backgrounds were in the incorrect places.
