Talk:Randuin's Omen/@comment-11045621-20130729121626/@comment-3974211-20130731233552

You take their current attack speed, say 1.6, and reduce it by 15% - 1.275 attack speed. Attack speed slows stack multiplicity. So if a Nunu comes along with another 25% slow, it reduces the 1.275 to 1.02. The net slow is 36.25%, rather than 15+25=40%.

Attack speed *buffs* apply first, even if they are activated during the attack speed slow.