Sledgehammer Strike -- Krogan Shaman Adept

Combining the biotic explosion strength of the Human Adept and the health and stagger resistance of the Kroguard with a loud and audible clunk, the Krogan Shaman was dropped on us as the first of the one-a-week characters. When you think of a Krogan, the image of a mage huddling behind cover waiting for a safe moment to hurl magic isn't the first thought to come to mind, so why play it like one?

Another build to ignore passives, and isn't much the worse for wear because of it. Biotic explosions do fixed damage, Warp makes a great debuffer, and there are enough guns that melt face even without passive bonuses to them. The Shaman does alright for himself without any boosts to his power or weapon damage, and his innate weight bonus can help him carry medium-weight weapons that still pack a punch.

Barrier: Toughens up our sledgehammer, makes him even more resistant to staggering, and can be detonated in a pinch to get mooks off you. Particularly useful when there's a Possessed Abomination on you that just won't sod off. Power Synergy vs. Shield Recharge is largely a matter of choice, but I like the little extra punch it gives the powers.

Warp: Simply one of the best powers in the game and a fantastic debuff, and this guy can really take advantage of it. Specced for maximum combo damage and weakening, it helps both you and your team. Not much else needs to be said about it, really.

Shockwave: Great for staggering things and striking through walls when things start to go south and not eating bullets becomes the preferred option. Recharge Speed is taken over the Lifting effect since anything that can be lifted will be pushed back by the Shockwave anyway, and with only the racial weight bonuses, the extra recharge speed is helpful.

Weapons: I've chosen the Piranha as the primary (and only) weapon, but any sufficiently strong weapon will do, weight considered. Talon, Hurricane, Wraith, Mattock, and Reegar are also solid choices. You could also carry around an Acolyte with or without Ultralight Materials if you so desired, but I do fine without.

Playstyle: The best way I've found to play this build is to find a few enemies separated from the pack, debuff them with Warp and unload on them, then Shockwave for an explosion if anything is left standing after your cooldown has finished. You can take a fair amount of punishment, but you don't have a convenient Biotic Charge or Annihilation Field to get yourself healthy again, so be careful not to bite off more than you can chew, and keep an escape route in mind if you think things might get too hectic.