Pantheon being subjected by Riot to make him into a bruiser top laner is lame, and I personally love my Pantheon in the mid lane. He can be played as a mid bruiser but you lose some oneshot capabilities. However, with this build you get pantheon's one shot back, with the passive empowering Q and collector many squishy champs can be sweeped the floor with. Issues with the build is you do not have a mage mid anymore and this can be replaced with a mage support or even jg but it is not needed as you will have black clever on the main build and shred armor. This build is fun and is highly unexpected by most mid laners now since pantheon is more of a bruiser now. The other builds are for incase you have a squishy team overall, assassin jg and mage top lane and someone needs to be able to tank a but more DMG.