IrdyaCanonSecretLore
Warning: The following page contains game secrets intended for campaign designers. We cannot stop anyone from reading it, but if you are a player you should consider hitting your back button now, as you will probably enjoy learning these things more if you do it through the hints dropped at various places in the mainline campaigns.
This is a work-in-progress discussing the Irdya Canon, the revised lore that will be in Wesnoth 1.16 onwards. Things on here might not be secret, but for a work-in-progress it's easier to write first and then decide whether it should be secret or not.
Forum threads
The main lore starts in the A grand design for singleplayer mainline lore thread.
Necromancy and secrets of the undead
High-level undead are much rarer than in the Classic Canon. Liches are much rarer, as having too many dilutes the storytelling. The Wesfolks' Lich Lords are still in the Irdya Canon.
Some races can't use black magic at all, this includes the elves and drakes. Any necromancers or liches of those races are automatically non-canon, even if they were in a 1.14 mainline campaign. Even if the alternative is torture (Mal M'Brin in 1.14's TSG), they just can't use it, the black magic rots them inside first (citation needed, it was said sometime on IRC).
Relevant IRC discussions: