I know - plenty of people got there WAY before me but It's still a big deal to me! If anyone's interested, this is how I did it: Thanks to some sound advice on here about selecting the right weapons I: 1 - Stocked up on different Elemental Weapons for making short work of shielded enemies AND 2 - Went back to the Scout Rifle for increased Impact vs the Pulse Rifle I'd come to use 95% of the time. What a difference: both of these changes made my attacks A LOT more effective. I then played through a couple of story levels before taking on three Patrols (two on Earth one on Venus with between 3-5 relevant Bounties active each time. That REALLY racked up the XP. So, I'm now a Level 20 Warlock with about 550 Defence and a kick-ass 186 Attack Scout Rifle that also has high impact and a decent size magazine. Also in the process of levelling a frankly ridiculous Machine Gun which already makes short work of pretty much anything. Ready for the big stuff now ... maybe ... :)