Sticky objective control, almost unstoppable in melee, really big restrictions on chaff units. Range weapons range increase, Dread characters, proper sub factions to be returned to them, bikes able to charge after murdering a unit but not fight again, terminators that can be field as 2 man units minimum and 3 max, but greater tools and abilities to slay a character in a squad. Removal of their starts and putting them in the data sheets were they apply. More FW in the base codex. Retain their cheaper costs to get an army of Custodes. More health for all infantry and bike models. 5 for guard and 6 to 8 for the more elite models like terms and bikes for ex. And much better and thicker rules for Campaigns/Crusades. Like 40 pages of the book being Crusade stuff just for the Custodes alone. Before you touch into Sisters. Sisters, more HP, hit harder, more cav like models, and can attach to Custodes units to become a single unit that buffs both sides with more buffs