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The addon brings to the game a new dimension called Alfeim, which can be reached using a special portal. It is land of plains and forests, contrasting with high plateaus with beautiful waterfalls, full of Botania mystical flowers, livingrock and dreamwood. In Alfheim you can meet harmlessy flying pink pixies or warlike elves - the indigenous inhabitants of this world, find magical space-time anomalies or there even is a chance to encounter abandoned ruins, such as arenas, where elves once fought with Gaia Guardians (those are worth searching for, you’ll see). In underground caves or high mountains you can dig out variable ores, from which you can craft new special armor or useful tools and baubles, or even trade with Midgard (Overwolrd) minecraftians for resources, not available in Alfheim. Fight against epic and more powerful bosses, earn new relics, discover elven secrets, and become King of Elves!

enabling MMO mode implies automatic activation of ESM and vise versa
MMO mode will add 2 items for lore-like usage of the new party system, allowing players to assemble in groups and track each others HP/MP values and disable 'friendly' damage. Also quite important part of the MMO mode are spells for each race's affinity. All spells consume mana from portable storages. The party and the spell systems work together with the targeting system, so some spells will not act on party members, and some on the contrary will be active only when used on friendly players. All those systems are combined together and controlled by so-called Cardinal System.

Natural Thaumaturgy - Alfheim submod adding compatibility with Thaumcraft

Copied (and slightly edited) version just in case:
Alfheim License
Alfheim is distributed under a reasonably open license. You probably want to have a read through this if you want to do something with it other than just play.
You are completely free and have the right to Use, Share and Adapt the addon. These rights can not be removed from you as long as follow the license terms.
If you simply wish to play with the mod and do nothing else, go for it, this section is of no use to you.

General Clauses
Clauses that apply in general to any of the uses that follow.

Personal Permission Clause
I will not give personal permission unless I know the person asking or there's a really good reason for it, as giving personal permission implies endorsement. Asking for personal permission will likely just end up having you ignored or redirected back to this section.

Waive Clause
All restrictive clauses in this license can be ignored with personal permission. Read the above clause.

Extensive Clause
This license applies to Alfheim and all other code, assets or binaries found on the bitbucket repository unless otherwise indicated.

Informal Clause
This license will not hold up in court. I have no intention of suing anyone for breaking it, the worst that can happen to you if you do is that I'll get annoyed and ask you to rectify your mistake. If you use a public distribution platform (such as CurseForge) it's also possible your project will get taken down. Breaking the license also makes you a jerk, and you don't want to be a jerk, do you?


If you want to Distribute Alfheim
"Distribution" refers to making available binaries, assets, or source of the mod available from the original sources as part of your modpack or otherwise.

Attribution Clause
You must give appropriate credit to AlexSocol as the creator of Alfheim and to Vazkii as the creator of Botania or the parts of it you're using. If you do any alterations the fact that you do so should also be indicated. A link back is optional but it would be cool if you would do so.

Non-Monetary Clause
You may not charge for access to the distribution itself or gain money through it, this includes any type of inline advertisement, such as url shorteners (adf.ly or otherwise) or ads in your service slowing the download down. This includes restricting any amount of access behind a paywall. Charging for ingame goods such as mod items or cosmetic features on a server does not count as distribution and falls purely under the Mojang Terms of Service.


If you want to Feature Alfheim
"Featuring" refers to using Alfheim in an environment where you do not distribute binaries, assets, or source. An example would be a YouTube Let's Play.

Thief Clause
You must not claim that you made Alfheim. Giving appropriate credit to AlexSocol as the creator of Alfheim and to Vazkii as the creator of Botania makes you cooler, but you don't have to do it if you don't want to.


If you want to Use Alfheim Code or Assets
Usage of code or assets falls under the Extensive Clause.

Attribution Clause
You must give appropriate credit to AlexSocol as the creator of Alfheim and to Vazkii as the creator of Botania or the parts of it you're using. If you do any alterations the fact that you do so should also be indicated. A link back is optional but it would be cool if you would do so.

Copyleft Clause
Your project must be open source (have its source visible and allow for redistribution and modification) and include a clause similar to this one in its license.

API Clause
Any of the other clauses under this section do not apply to any Alfheim API code. However, if Alfheim API code is used, it must be included verbatim as it was obtained. Furthermore, the package-info.java file included with the API must be present, and in the right spot, for any mods that package any compiled API classes within to prevent conflicts.