Oh hello. This guide is intended for a mid slark,however it may work on safelane/offlane too.
Slark is one of the few heroes that can go 1v5,kill 1-2 then get away with full hp. That's due to his epic ultimate and epic dispell powers (first skill) . Feel free to make your own adjustments to the item build depending of the situation,however my build covers most types of enemies. ;)