Building HP Olaf is a great way to lane solo top. i start out building phage for some slow and HP and go straight to Wiggle's lantern for life steal and a ward. Then building Phage into Trinity Force and frozen mallet since they both have slow on hits its a great combo. and sheen in Trinity is also great since olaf does use alot of his move ever 2 sec.then i build Black cleaver for some damage and armor Pent. to go with armor pent runes and dealing almost true dmaage. the i build more HP( Warmog's) so that it would go great with Maw of Malmortius.