Battle for the Fell Stone

The Battle for the Fell Stone was the valiant Imperial campaign fought by the Emperor's Trident Space Marine Chapter and local Astra Militarum forces in defence of their Chapter homeworld of Oranthi against a warband of the vile Emperor's Children Traitor Legion.

History
Within the first weeks of the 42nd Millennium, while all of the chapter regrouped at their homeworld, Oranthi was invaded by a large warband of Emperor's Children. The battle was fierce with losses on both sides. As the battle was at its fiercest numerous Warp Portals opened in the Fell Stone causing the Daemons of Slaanesh to pour into the Fortress Monastery. The Warp Portals were only able to be closed when the Majority of the chapter's Librarians sacrificed themselves by using their psychic minds to close the portals, this cut off daemonic reinforcements allowed the Emperor's Tridents to push back the traitor's assault on the Fortress Monastery. The Warden Velsar and his personal bodyguards dueled against a vile Keeper of Secrets known as Alnth'slthys, while Velsar was able to banish the daemon back to the warp it was at the cost of his bodyguards slain by the daemon. Even with the portals closed many daemons were still present within the Fell Stone, many daemons fill almost every level with very few levels secured by the Emperor's Trident, in their Desperation the chapter awoken all of their Dreadnoughts to help bolster their defenses then chapter serfs rang a large bell at the highest point attracting Drowned men. The Drowned Men took the Emperor's Children off guard and in their distraction the Emperor's Trident assaulted the traitors with their dreadnoughts leading the charge. When the Fell Stone was taken back the Traitors' plan was realized when the gene vaults of the chapter were found raided and all the Astartes that were task to guard it were all found butchered and mutilated, the chapter focused their efforts on purging the traitors on their planet, the chapter fleets emerged from their docking stations on the moon of Werlago and assaulted the traitor's fleet. As the battle on both the world and the void raged on many Trident ships were destroyed including the flagships of the 5th, 8th and 12th companies, known as the the Unforgiving Wave, Kraken's Heart and the Call of Sorrow. What happened next, was through the combined efforts of Oranthi Clans and the chapter working together, they were able to finally push back the darkness. After the traitors were forced off-planet, the chapter went on to reclaim several lost worlds.