I've put a whole lot of work into my first mod, and am now just polishing it up:
New Master Quest, "The Lost Forge"
-3 different endings, slightly larger than Master Quest or Dragon Statue quests
-Alternate History variation on the campaign story, but for the sandbox game (still very loyal to game lore)
-Very hard (at least at the end). Designed for those who find the late game light on anxiety, or anyone who ever said "the Waerloga fight isn't THAT hard."
-Some new items, units, spells, and some surprises
Coming within a week, to a mod folder near you.