Note: Though the mission's name suggests you should go to the Kallini system of the Nimbus Cluster, the monastery is actually in the Mesana system on the planet Lesuss. This mission, discounting alternative ways of progressing through the game, introduces another Reaper perversion into their arsenal of troops. Most enemies here only have health and are equal parts melee and range. Most of the ones who do have protection have high armor and barriers. Your abilities selection should focus on powers conducive to fire and biotic explosions: Warp and its ilk should shine here.