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 basic formula was: Base Cooldown × (1 − CDR ÷ 100)

CDR was capped at 40%, though it could reach 45% with Cosmic Insight. Each point of CDR had a gold value of 26.67.

Sources of CDR:

1. Items

• Regular items with unnamed CDR
• Items with Unique Haste passive (+10% CDR):
  • Archangel's Staff
  • Hextech GLP-800
  • Lost Chapter
  • Luden's Echo
  • Seraph's Embrace

2. Runes

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

3. Neutral Buffs

• Cloudbringer's Grace
• Crest of Insight

Special CDR Types:

Ultimate Ability CDR:

• Ultimate Hunter and Cloudbringer's Grace stacked additively
• Regular CDR stacked multiplicatively with these

Item CDR:

• Cosmic Insight and Ingenious Hunter stacked additively
• Multiple copies of active items shared global cooldowns

Summoner Spell CDR:

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

Maximum CDR Build (45%):

1. Cosmic Insight + Transcendence (15% at level 10)
2. Ionian Boots of Lucidity (10%)
3. Any 20% CDR item options:
   • Frozen Heart (2700 gold)
   • Iceborn Gauntlet (2700 gold)
   • Hextech GLP-800 (2800 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 through:

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

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