The 1st act is Scott who assembled a team. They take a modified Shiar's plane from the Moon.
Followed by Hickman's explanations as usual:
1st it concerns the Sentinel and their evolution to Nimrod.
2nd explanation is about what Moira IX discovered about Nimrod and what she did with Xavier to counter Nimrod's creation in her 10th life because it's apparently the biggest problem against mutants' supremacy.
3rd explanation is Project ACHILLES a superhuman prison.
2nd act: the trial of Sabretooth in ACHILLES: he's rescued by Emma with 2 of the Stepford Cuckoos who call her "mom". She used the diplomatic immunity to save him.
4th explanation from Hickman: this time he explains the process of human infection to transform into an Omega Sentinel.
3rd act: at the ORCHIS Forge: the human are surprised by the fact the X-Men knew what's going on. They send some Sentinels but they are destroyed by the Shiar's battle ship. Kurt teleports him in the base and see Karima and then returns to prevent his crew of the presence of an Omega Sentinel.
They tried to enter by cutting through the hull of the station. One of the human we saw on the beginning sacrificies himself to stop them to enter and BOOM the X-Men are dead!
5th explanation from Hickman(this guy is seriously crazy and you should know it by now): the Karakoan alphabet is given at the end fo this issue.