User blog comment:Chase999/Arikka, The Hydra's Mistress/@comment-7709681-20160207165327/@comment-22636720-20160209084453

your description is confusing me a little so let me try to do the description here before typing it down on the page.

Hydra heads can give a champion a total of 1 stack of Hydra poison to a champion every 2 seconds (This means that a champion can only get one stack even when attacked by multiple Hydra Heads). The Stacks then degrade at a rate of 3.5 seconds one by one if not attacked by Hydra head for 5 seconds.