Talk:Sejuani/@comment-122.52.99.147-20120117035557/@comment-4046013-20120117040006

If you search for "slow", they explain it. Only one item-based slow can be active at a time, and all active slows stack multiplicatively, with the strongest counted at full strength and the others divided by two. Mallet would be noticeable, but Rylai's would be sort of questionable, you'd have to test it.