This is a modpack that adds all sorts of features from all kinds of mods. It improves vanilla features, adds new biomes, weapons, mobs, features, blocks, and pretty much everything.
The purpose of the modpack is to make minecraft have a kind of medieval/fantasy feeling. It is meant to make multiplayer much more interactive and immersive, while also keeping it simple.
Some of the most important mods used in this modpack are:
Alex's Mobs
Create
Biomes O' Plenty
Epic Knights
Quark
Oh The Biomes You'll Go
There are other mods, but they are mostly small additions and tweaks to the game for quality of life.

