A new Knight hits the battlefield and it is big!
From Forge World:
Taller than even the towering Cerastus Knights, the Acastus Knight Porphyrion is a dominating presence on the battlefield. The Knight’s main weapons are a pair of twin-linked Magna Lascannon, devastating weapons an order of magnitude more powerful than even the Sollex pattern Heavy Lascannon of the Mechanicum Taghmata.
Where a Knight Paladin may carry a heavy stubber as a secondary weapon, the Porphyrion is armed with a pair of autocannon which are often replaced with Lascannon when additional anti-armour firepower is necessary. It’s Ironstorm Missile Pod has a substantially larger payload than those found on more common Knights, though in battle-zones where the danger from airborne assault is apparent, this system can be replaced with powerful Helios defence missiles.
Rules for using the Acastus Knight Porphyrion in both Mechanicum Taghmata and Questoris Knights armies in Horus Heresy games can be downloaded from the Download tab on this page.
The Acastus Knight Porphyrion is a complete, multi-part resin kit. It includes several optional secondary weapons.