Horus Heresy players will find guidance on taking additional super-heavy vehicles as Lords of War in The Horus Heresy Book Two – Massacre.
These are only for use in games set in the Horus Heresy using the bespoke Battles in the Age of Darkness rules.
Players should note that Forge World’s Horus Heresy supplements already contain units listed as Lords of War. The following is a list of Forge World models that should be considered Lords of War choices and may therefore be taken using the guidelines detailed in Warhammer 40,000: Escalation, along with the publication in which the model’s most up to date rules can be found. With the publication of Warhammer 40,000: Escalation, players now have the option of taking Lords of War choices in their armies. Here is the document below and of course to download your own just follow the link Something special to note is that the Adeptus Sororitas are given several different options here for super heavies, including Reaver and Warhound Titans.
This really expands the use of these huge war machines, and brings in more titans, tanks, and flyers.
Forgeworld has updated its books to include the Lords of War for warhammer 40k in a pdf that can be found on their website.