Then head the opposite way to encounter Emma Frost, who adds a new set of
tasks to your Objectives list. Look to the right side of this room for a
sunken altar pit, Juggernaut's comic is behind the altar. Keep on going
straight and you'll come to a room with a +6 Body tech station. Coming out
of that room, turn right and fight your way through needless filler to get
to the exit to the Madri Cloisters.
The Cloisters is a spiral hall, so you go 'round and 'round. The second
room on your left contains the Artifact of Rage, but you can't open the
door. (Exploit alert: teleport through the wall with Nightcrawler/Deadpool
and your teammates will also jump through the wall, so you can go ahead and
get the artifact immediately.)
Continue along the hall to the next room on the left, where you can make an
offering (and pick up a Danger Room disc, Challenge - Scarlet Witch). Once
you make an offering, the door to the artifact room opens, so go back, pick
it up, portal through, place it on the altar and portal back.