Training Edition allows no outside gears and few outside items. Details can be found here.
The War of Emperium is a game feature that allows guilds to fight in order to conquer a Castle to be the headquarters for the guild.
Owning a Castle gives your guild some exclusive benefits. Every night at Midnight server time, 4 or more (depending on the economy of the castle) treasure boxes will appear in the castle giving useful items and equipment. There is also a special Guild Dungeon accessible to everyone in the guild. These dungeons have several strong monsters that in some cases do not spawn in the normal world.
TE system is currently in open beta testing for balance. Godly drops (from castle treasure) and God Items Quest 3 are not implemented.