You read it right: Rammus kills himself against Vayne!

Having a full AD team we opt for Wit's End+Thornmail+Guinsoo's Rageblade(unfinished) combo, which makes us deal a good amount of magic damage (Grasp included) still keeping the build very tanky. The results? RAMMUS can't attack us or he will just be deleted! Wit's End is really valuable in this build as it is an attack speed item which also gives tankiness, thus it can really help out in some situations, but I usually prefer rushing Frozen Mallet to have more kite potential.