The Protectors of Etheria is a stand-alone mod of the game Warlords Battlecry 3 (i.e. it can be run without having the original game installed - 100% free full game). It is an improved RTS/RPG game with new campaigns, quests, terrain, units, items, heroes, modding features and more. Beta versions available for download!
coming in 0.8.9
How did you manage it? New building, or do the normal walls actually connect diagonally now?
Redwater's code finally done for this! So cool man.
Is it a seperate Wall set, though?
There might have been an adition of 3 walls in the game (2 diagonal walls and the 4x4 losange/rhombus) but they surely work together with the old set, I think. In 20 days we'll know anyways, if you've seen the video teaser: Youtube.com.
There are plans to implement the diagonals in the click & drag code.
Already implemented.