In the license it says "You're not allowed to create commercial game engines/game editors/game makers with the software".

Would making a game specific editor (like, the editor found in Warcraft 3) be considered a "game editor"? It would not be able to make standalone games, but only maps for a game made with the Esenthel engine.

Thanks!

no, because it is game specific.

Alright, thanks for the clarification.

You can create editors that are specific to your game.
You can't create editors that allow making games in general.