User blog comment:Shinramen/A pre-spotlight look at Vayne, the Night Hunter./@comment-136.159.70.10-20110509190018/@comment-3457312-20110509203230

@OP, I debated the two items while I was writing this build and the more I think about it seems to make more sense in most cases. Especially if slowing is our priority, then Mallet gurantees slow every hit while is a reactive chance or cool-down based.

@Anon, I've thought about Tiamat too and it's tempting to dream of true damage splashing around and owning everyone. But, I feel like she'll excel at being a chaser/assassin against solo champs and find Tiamat unnecessary. I can see how it could work in teamfights, but not every single team fight will gurantee you the opportunity for a splashing true damage Vayne to shine. However, if her true damage % is formidable I'm sure we'll see a Tiamat on a Vayne or too; especially if her Tumble was a very low CD. Also, 35% for ranged :T