Arius as a server offers 3 main gamemodes.

The main focus is on dungeons, when you join you'll be able to use the in game economy to get weapons and tools to grow stronger. Every dungeon has custom mobs and bosses. Dungeons also offers custom items and quests.

The Species SMP is a survival world (with nether and end) that allows you to play as different species, its kinda like origins but without a mod needed.