Posts from Is it possible to add new spells? Auto-translated

I'm looking for a way/mod or a hint on how to add new spells for multiplayer games. I've seen mods for new creatures, artifacts, etc., but not for spells, only for their modifications. I would like to enrich, for example, the summoning branch. I know that there are many problems with this, but I need at least some information.

In the game, there are very few spell IDs that are not used or are rarely used; modders usually base their creations on these. Otherwise, no, it's not possible to add more.

The game has very few spell IDs that are not used or are rarely used; modders usually base their creations on these. Otherwise, no, you can't add more.

Good afternoon! Where can I see how many free slots there are for adding spells?