Cooldown Reduction (CDR) was a crucial statistic in League of Legends that reduced the cooldown time of champion abilities. It didn't affect static cooldowns or on-target cooldowns unless specifically stated.

The maximum CDR cap was 40%, which could be increased to 45% with Cosmic Insight. The calculation used this formula: Base Cooldown × (1 − CDR ÷ 100)

CDR could be obtained through three main sources:

• Items
• Runes
• Neutral buffs

Items that provided CDR included:

• Archangel's Staff
• Hextech GLP-800
• Lost Chapter
• Luden's Echo
• Seraph's Embrace

Key runes for CDR:

• Ingenious Hunter
• Ultimate Hunter
• Transcendence
• Cosmic Insight
• CDR rune shard

Neutral buffs that granted CDR:

• Cloudbringer's Grace
• Crest of Insight

Special CDR Types:

1. Ultimate Ability CDR:

• Ultimate Hunter
• Cloudbringer's Grace (These stacked additively with each other but multiplicatively with regular CDR)

2. Item CDR:

• Cosmic Insight
• Ingenious Hunter (These stacked additively)

3. Summoner Spell CDR:

• Cosmic Insight
• Ionian Boots of Lucidity
• Howling Abyss aura

Maximum CDR Strategy (45%):

1. Take Cosmic Insight and Transcendence (15% at level 10)
2. Purchase Ionian Boots of Lucidity (10%)
3. Buy one 20% CDR item such as:

• Frozen Heart (2700 gold)
• Black Cleaver (3000 gold)
• Luden's Echo (3200 gold)
• Trinity Force (3773 gold)

Level 1 Maximum CDR: The highest possible CDR at level 1 was 15%, achieved by:

• Having Cosmic Insight (5%)
• Getting Crest of Insight from Blue Sentinel (10%)

Each point of CDR had a gold value of 26.67.

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