Drenthal - The Drenthal Campaign: Situated near to the Forge World of Konor, Drenthal is a vast blue orb ringed by burning orbital stations and warring battleships. The remnants of the Konor Defence Fleet are trapped in orbit around the planet, encircled by a Chaos armada that vomits more landing ships into the Drenthal's upper atmosphere with every passing solar minute. The Ocean World's close proximity to Konor has made it an invaluable target for both Chaos and Imperial forces, as it is perfectly placed to stage counterattacks and naval bombardments of that vital war zone. The planet's orbital shipyards and gun platforms have already been atomised by Macrocannon fire and hull breaching missiles, but Drenthal's planetside defences have not yet been overrun. However, most of the seaborne habitations known as seasteads were aflame, set alight by incendiary rockets and bombs unleashed by Chaos flyers.In those seasteads that still stand, and across the island archipelagos, Imperial defenders fight savagely for every scrap of land, fending off massed aerial assaults and naval invasions. Imperial drop troops and Primaris Space Marine Inceptor Squads fearlessly hurl themselves into the fray, hurtling down from low orbit to smash into the enemy ranks. Attack Bikes and Land Speeders roar across banks of treacherous shard-coral, knifing into the flanks of advancing columns with Bolters blazing. The ground battle is ferocious, but Drenthal's terrain is ill-suited to massed formations of armour and infantry, and so the fiercest battles rage in the skies above. Hell-forged drakes screech and whirl above the devastation, snatching Imperial transports out of the sky, or swooping low to incinerate terrified soldiers and civilians. Every Aeronautica Imperialis aircraft available is in the air, launching endless sorties against these daemon-forged monsters, supported by the Stormraven gunships of the Adeptus Astartes.Burning wreckage fell like rain across Drenthal. The Imperium, dreading the prospect of a Chaos victory, began to prepare a doomsday strategy to deny the Heretics their prize. Should all appear lost, Drenthal's fusion-powered drill platforms, which mined vital fuel-crystals from beneath the planet's crust, would be set to overcharge. The resultant geothermal trauma would tear Drenthal apart in a last act of spiteful defiance of the Plague God.Smoking wreckage fell across Drenthal's endless oceans like a meteor shower as the armies of Mankind sought to scour the legions of Chaos from the face of the planet. The enormous seasteads were set aflame, ignited by daemonic fire and hammered relentlessly by Traitor artillery. The virulent plagues of the Death Guard spread with horrifying speed amongst the remaining civilians. Imperial High Command swiftly came to a grim realisation -- Drenthal could not be saved. Instead, it must be denied to Chaos. By overcharging the titanic fusion drill housed at Terebral Station Sigma, the Imperials would finally unleash a tectonic catastrophe upon their hated foes.As the brutal fighting escalated in the cramped alleyways of the floating seastead hive cities, warriors splashed though tides of bilge water and spilt blood, past bloated corpses and shimmering Promethium slicks. The sense of havoc and confusion was only exacerbated by the actions of a hidden cult of xenos-worshipping traitors that had long lain dormant amidst the vore-whale tanneries and Promethium refineries of Drenthal. Forced to the surface by the war erupting all about them, these mutant killers slipped from sewer access hatches and bilge tunnels to fall upon any intruders, striking with swift and deadly force before retreating to their hidden lairs with purloined weapons and ammunition. Rumour spread of even worse horrors that crawled out of dark hiding holes to snatch away unsuspecting Imperial soldiers, dragging them screaming into the pitch blackness of the underwarrens.The battle also raged across Drenthal's scattered island archipelagos. Assault Bikes and Land Speeders roared across treacherous coral-dunes, the air echoing to the ceaseless chatter of pintle-mounted Bolters. As vicious as the ground war had become, the battle in the air was just as deadly. The full might of the Aeronautica Imperialis was unleashed upon the Chaos invaders, and vast wings of Stormravens and Valkyries met with flying Daemon Engines in a murderous storm of flak-bursts and blossoming explosions.At Terebral Station Sigma, the Forces of Chaos launched furious assaults against the Imperial occupiers, while Enginseers tried in vain to enact the machine-rituals necessary to sabotage the fusion drill, chanting desperate prayers to the Omnissiah as they worked. It was too late even for such desperate measures. A cabal of Chaos Sorcerers channelled the aura of savagery and carnage rippling across Drenthal, and tore open a wound in reality, spilling daemons into the cavernous drill chamber. In an orgy of bloodshed, the Enginseer work crews were slaughtered, and the destruction of Drenthal averted. The Ocean World proved a fine staging point for the assault by Chaos upon Ultramar.