Whats full build out on cosmic lok if you dont mind. inc artifacts?
I've built a bit defensive(mainly health) just to give me some room for error, though full out glass cannon works just fine as well depending on build. I'm running Sorcery...
Max: Master Sorcery, Bouncing Bolt, Arcane Shield, Lay Waste, Arcane Binding, Unyielding Power
1 Pt: Jotun Blood, Enemy of my Enemy and Lord of Deception - Can dump rest of points into any of them, I go with LoD just to keep my meat shields(pets) around bit longer.
Artifacts: Adv. Meta, Pluvian Superconductor, Mental Focus Headband(Modok drop) and Starstone Tooth. I could drop the Starstone, and replace it with an Adv Super Soldier, or just go damage.
Slot 1-5: Full Uniques. The crown doesn't help my dps at all really but I like the extra safety it provides via pet procs/bonuses. Boots also could be tossed for a good Cosmic, but I haven't found one with +skills I want yet.
Medallion: Wizard
Relic: Gibborim(Spirit) - All the offensive relics are shit, and my Lemuria/Subterranea are only other heroes.
Ring/Insignia: I have terrible luck with these, I am using a Spider-Man Insignia since it can proc Confuse to buff Lay Waste.
Core: Life Leech with 25% Hp/Spirit...the LL is helpful but I only just got it few days ago, ran cosmics without it just fine. The 25% is what I really wanted due to Lay Waste being a huge mana hog on long fights.
Costume Affix: Health
I have also ran a build where I dropped Bouncing Bolt/Lay Waste for Winters Breath/Permafrost Spikes, and it did quite a bit of damage, downside being Winters Breath has a pretty short range. Good thing about Loki is you can hit 60, slap on whatever artifacts/gear you have and run Cosmics without a lot of hassle. It may take you a bit longer at first, but you shouldn't have a death-fest like many other heroes.