Miracle of Tetragrammaton

The Miracle of Tetragrammaton was a campaign that was a part of the larger w:c:warhammer40k:Indomitus Crusade that occurred when the a large Slaaneshi Chaos Warband laid siege to the Chapter homeworld of the Exalted Seraphs Space Marine Chapter. Fighting alongside their newly acquired Primaris Space Marines and timely reinforcements of the newly returned Ultramarines Primarch Roboute Guilliman, the Exalted Seraphs were able to turn the tide and eventually triumph over the Forces of Chaos and save their homeworld.

History
When a huge Slaaneshi warband, led by a traitorous Fallen Chaos Lord by the named Luis Seyfer befell the homeworld of the Exalted Seraphs for revenge and the humiliated defeat of Tetragrammaton by the Exalted Seraphs. With the newly acquired Primaris space marines to replenish the Exalted Seraphs loses by the timely return of Roboute Guilliman and the reinforcements of Tempestus Scions repelled the forces of Chaos that turned the tide of the battle. After the triumph over the traitors, the Cherubwing Lord Seraph Gadreel and some of the nobles showed their disdain for these abominations that Guilliman had brought. Both Metatron and Mastema scolded them for being ungrateful. As punishment Metatron declared that the noble-exclusive ranks of the Chapter can be taken by non-nobles with the exception of the Cherubwing and Lord-Elohim.