Talk:Warden's Mail/@comment-157.159.40.81-20100812143810

When you have 2 of them, not proccing both results in not applying the debuff. 80% chance not to proc per item. So its 64% chance not to proc both (0,8*0,8 = 0,64), resulting in the 36% in the important note.

tdlr : 4% to proc both, 32% to proc one of the two, 64% not to proc any