Elemental: War of Magic was built to be modded by a wide variety of people, from people who haven't ever written a line of code before to the hardcore full conversion modders. This will be facilitated by the number of available tools that Stardock will release which include Tile Editors, Map Editors, Lighting Effect Editors and the vast amount of changes that can be done via the XML files.
Sometime after release Stardock will release the game's SDK (Software Development Kit) that will allow modders to do full conversions of the game's engine. They have mentioned someone could be able to change the game from TBS to RTS. It was also mentioned that Stardock will release a comprehensible guide on modding that will cover many aspects of using the XML, and as of Beta 4 Frogboy has released several starters Guides that serve as an example on how simple it is to modify some aspects of the game by using XML.
In this section we will cover all modding related info currently known and available, including info on the Tile Editor, Map Editor and the guides that Frogboy posts in the developers journal.
Mod Week Begins In this link he tips us on how to change the speed of arrows.
Modding Guide Basics on what we will be working with as of Beta 4.
Part 1 - The Basics Tips on rules to follow when Modding and info on objects.
Part 2 - Factions Example on how to create your own faction using XML
Elemental will come with a very powerful built in map creator, and with a bit of XML tweaking the size of the maps can only be limited by your current hardware.
The tile editor is a real cool feature that allows you to make custom tiles using in game 3D assets. Even cooler is the fact that you can use these tiles for whatever you want, for example you can make new goodie huts, city improvements and just cosmetic tiles that you could add to your custom maps made using the map editor.
Particle Effects Editor:
As of Beta 4 this isn't implemented yet, but at release they are supposed to add this to the Workshop tools and with this cool feature you will be able to make custom effects which could be used for your own custom spells, or you could just add it to a custom tile to make it look more impressive.