Not sure if that was ever communicated but we made a change in version 0.9 which was to remove city bonus on ruins and instead use undead lore as a battle bonus on ruins. In fact I had forgot about that and thought we never made that change.
Suppose I have a Stack consisting of a L1 DreadKnight, L1 Ranger, Wizard, 2 Scouts on the ruin, do they have strength: 25+8, 25+12, 25+2, 5+1 respectively, or 25+8+2+1+1, 25+12+2+1+1, 25+2, 5+1?