Guardians

Guardians is the fifteenth and final campaign level of Halo 5: Guardians. . Completing the level on any difficulty unlocks the 'Sentinels' achievement, worth 10 gamerscore points. Using a ground pound on one of the exterior power cores unlocks the 'Icy Cool' achievement, worth 10 gamerscore points. Simultaneously destroying two power cores on Heroic difficulty unlocks the 'Double Stuff' achievement, worth 10 gamerscore points.

Transcript
{Gameplay}

''Fireteam Osiris stand in a Forerunner hallway leading into a large room ahead. 031 Exuberant Witness hovers above them. ''

Exuberant: The Gateway. I tried to warn them and - well, here we are.

Edward Buck: Once Chief knows the destruction Cortana's caused, what do you think he'll do?

Holly Tanaka: The man'll do the right thing. Always has.

''Exuberant flies into the chamber ahead, and pauses to examine a hologram of a Forerunner Cryptum. Fireteam Osiris follow her. Several Promethean and Covenant specimens can be seen trapped in cells around the room.''

Exuberant: Oh, this looks interesting. Oh, maybe this is terrible!

Jameson Locke: Exuberant?

Exuberant: Cortana has activated a Cryptum.

Tanaka: A what?

Exuberant: This is a Cryptum. It is a device for extended forced meditation. Cortana has placed the other humans inside.