Скачать или смотреть Mass Effect 3 Priority Thessia

Next to the final level, this mission is very visually pleasing.

There are two major chokepoints in this mission.

First, after meeting the Asari sniper and after fending off a Reaper thrall squad with gunship aid, you'll be traveling on a bridge covered in rubble. Eventually, two harvesters, some marauders, and two Rachni will all ambush you.
Take out the barrier engine A.S.A.P and move forward along the right, trying your best to stay in cover. With any luck, you'll trigger a scripted event that will make the Harvesters back off.

Afterwards, enter the Temple of Athame. The artifact you are looking for is in fact the big central statue approach it and analyze the panel below it. Liara will mention that a matrix needs to be triggered.
The correct artifacts to construct the matrix are:
the upper-leftmost codex page
the prothean-bust in the right half of the temple
and the Athame's shield near the entrance of the temple

Kai Leng will attack. You can't kill him, but you can mess with his shielding. After taking some damage, he will retreat to recharge while a gunship shoots down on you. Stay in cover, and keep hammering away on his shielding.

He will summon the gunship again. Eventually, he pretty much decides "screw this" and a cutscene starts.

Enjoy this mission's depressing ending.