Mass Effect 3/Thessia's Monastery

This level is pretty much a 3rd person shooter "Call of Duty" except in the future. Anyway look for cover everywhere you go.

Turret Syndrome
Before you go into battle, check around for experience and items first. Once you get on the turret, make sure to take down every monster crossing the busted bridge. If any monster is out of range where you can't shoot, you have to start over, but if you succeed, you'll have a conversation before going through the next section.

Note: if you have Javik in your team, there will be a unique cutscene in which his honesty strengthens the female commander.

Sniper territory
Cross the bridge taking out every enemy along your path. Including the stone eggs which will hatch if you get too close. Climb up a couple of rubble area to meet one of her soldiers. You can shoot from the top but you have to aim as enemies can move in and out of cover.

Never ending danger
Once that's over, get down from the top and follow the path until you see the last soldier which you ask her to bring down helicopters. With the tension escalating, you will be dealing with lots of brutes. Follow the path until you reach the entrance of the monastery.

Sign of the monastery
After the conversation, find the inputs that would unlock a Prothean messenger. He's about to tell you where the Catalyst is until he detects danger by the Illuminati's dangerous hitman: Kai Leng.

Kill Kai Leng Vol 1
You basically have to shoot him down. But the danger is the helicopter so find cover and only shoot once the chopper finishes shooting. Depending on the difficulty, it will take few times or more before the show ends. Well the chopper blow missiles on the columns and nearly let Shepard off the ledge, leaving everyone feeling let down.