User blog comment:Emptylord/Archived/Odyssey the Hired Gun/@comment-74.65.211.149-20120321214922/@comment-3974211-20120322031024

He only has one or the other. He's either slippery or durable.

Also, the effects are suppose to create diminishing returns.
 * In order to get the most CC reduction he has to have been subjected to 3 pieces of it.
 * In order to get the most tankiness he has to have taken at least 3875 physical/magic damage during the 15 seconds. And note that the more armor and mr he has the less damage he actually takes...