User blog comment:Blurghblah/LVDP Item Rework Suggestion/@comment-10958553-20130919182326

I don't like that it builds off of tiamat. Additionally Tiamat has health regen but it was apparently lost when this item is built. I would prefer it build off of Exocutioners Calling.

While it does give crit chance (yes that is for auto attacks) it does prevent healing (which is a very assassin like ability) you could even change it so that dealing physical damage (as opposed to only auto attacks) will proc this passive.

Additionally I think that the item should only give 10% Spell Vamp. but have an additionaly passive.

"10% armor penetration against targets with 40% or lower health."

While you stated that armor pen was OP (and it is) this would restrict it you your final blows. This makes the character better at finishing off those straglers, and will assist in evening out the AD caster's problem with bruisers.

Lastly, Urgot is an AD caster :( why you forget Urgot!