If the enemy players have a pa or a hero with an annoying source of evasion switch out the desolator for a monkey king bar. A swell as if the other team's spells and and powers are locking you down and you cant get your skills off and die to quick switch the butterfly in for a black king bar. This build is just something i have discovered, the mjollnir being the main focus. I have found that it is very good in my opinion on the hero, you can use it to split push, farm, support an ally, your ultimate's soldiers proc it and so does your boundless strike. This guide is in no way from a strategical standpoint it focuses on you jumping in with a powerful primal spinning then using echo sabre and your ult to get some jingu mastery stacks and then at full stacks(if they aren't all dead yet) casting boundless strike on them to strip them of half their hp. Out of the 6 games i have played so far as monkey king i have won all of them with this build and you will too!