In regular dota, you can only ever have two static percentage based sources of CD reduction, one from your hero, and one from octarine core.
It appears as though the hero sources of CD reduction (talents and bad juju) reduce CD with a flat rate, and then octarine on top of hero sourced CD reduction will stack diminishingly like evasion.
As a result, Bad Juju stacks fully (additively) with hero talents that give CD reduction. This means that drow gets 100% CD reduction when she reaches level 25 if she also has Bad Juju. (Drow level 25: 50% CD reduction + Bad Juju: 50% reduction = 100%)
With arcane boots for infinite mana, drow can infinitely spam any spells or items with literally zero CD.
The interaction between mutliple hero sources of CD reduction needs to be changed to stack diminishingly also.
See the following video for wtf mode drow madness: https://youtu.be/XwIR2GgBmCI?t=376
It appears as though the hero sources of CD reduction (talents and bad juju) reduce CD with a flat rate, and then octarine on top of hero sourced CD reduction will stack diminishingly like evasion.
As a result, Bad Juju stacks fully (additively) with hero talents that give CD reduction. This means that drow gets 100% CD reduction when she reaches level 25 if she also has Bad Juju. (Drow level 25: 50% CD reduction + Bad Juju: 50% reduction = 100%)
With arcane boots for infinite mana, drow can infinitely spam any spells or items with literally zero CD.
The interaction between mutliple hero sources of CD reduction needs to be changed to stack diminishingly also.
See the following video for wtf mode drow madness: https://youtu.be/XwIR2GgBmCI?t=376