Level-up messages for levels past 20 are hardcoded not to be used
From this forum topic: https://forum.openmw.org/viewtopic.php?f=8&t=4633&p=49748#p49748
As the title states, adding additional level up messages for levels above 20 does NOT work in OpenMW, while it did in the vanilla game.
I came across this by trying to create new LUMs myself by editing the following into my openmw.cfg file:
fallback=Level_Up_LevelX,"MESSAGE HERE"
Where X is obviously the number of the level, and MESSAGE HERE the level up message I want to add.
In-game, however, this does nothing.
It seems to have worked in Vanilla Morrowind, however, as seen by this mod (http://www.nexusmods.com/morrowind/mods/43431/?), which manages to achieve the desired effects by editing the INI file.
(RM-4094 from redmine: created on 2017-09-10 by R C, , closed on 2017-09-11 by Andrei Kortunov)