But the leveling part is rather easy, and you should be fine following any of the Trees first. I have personally leveled up by spending Points in the Hitman Tree up to the Violent Violence Passive and then switched to Doubled Agent to get the extra Grenades from the Duct Tape Mod Passive. The Under Cover Tree offers good defensive bonuses and extra team utility, however, we have decided to optimize this build for playing Solo, so you shouldn't bother with it at all. This build utilizes the Hitman and Doubled Agent Skill Trees since they offer the highest bonuses to Gun Damage and Movement Speed. Amazing utility skills that make it a perfect Solo buildīelow you will find the recommended Passive for the Fastest Zane build.