They should stack multiplicatively. Octarine Core stacks multiplicatively with arcane runes.
The reason is very simple: If more sources of percentage cooldown reduction get added in the future, a combo would allow a hero to have like 100% cooldown reduction, similar to how you can currently have 100% damage resistance with Enrage + Overcharge. Also, on some spells (like Black Hole and Ravage), it already makes a huge difference currently.
This affects the following heroes:
* Abaddon
* Arc Warden
* Batrider
* Beastmaster
* Broodmother
* Chaos Knight
* Dark Seer
* Death Prophet
* Disruptor
* Ember Spirit
* Enigma
* Gyrocopter
* Legion Commander
* Lycan
* Morphling
* Phantom Lancer
* Queen of Pain
* Rubick
* Sniper
* Techies
* Tidehunter
* Tiny
* Treant Protector
The reason is very simple: If more sources of percentage cooldown reduction get added in the future, a combo would allow a hero to have like 100% cooldown reduction, similar to how you can currently have 100% damage resistance with Enrage + Overcharge. Also, on some spells (like Black Hole and Ravage), it already makes a huge difference currently.
This affects the following heroes:
* Abaddon
* Arc Warden
* Batrider
* Beastmaster
* Broodmother
* Chaos Knight
* Dark Seer
* Death Prophet
* Disruptor
* Ember Spirit
* Enigma
* Gyrocopter
* Legion Commander
* Lycan
* Morphling
* Phantom Lancer
* Queen of Pain
* Rubick
* Sniper
* Techies
* Tidehunter
* Tiny
* Treant Protector

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