Talk:Amumu/@comment-24330271-20140609002621/@comment-15280970-20140619052937

Or Tanky items like Abyssal, so your team AP's Benefit from 45 MR reduction.

Try the superdamage build: Randuin's, Thornmail, Liandry's, Sunfire, Abyssal.

35 Magic penetration. 60 with your passive debuff.

How does it work: An enemy attacks you. Thornmail deals him magic damage and Randuin's Slows him. Since he is receiving magic damage and is slowed, he procs Double Liandry's as long as he attacks you.