Since the beginning of August LowRate has seen the Invasions every Tuesday and Thursday.

Tuesdays are for Lower level Invasions seeing monsters ranging from Oma's to Minotaurking's.
Thursdays are for High level Invasion seeing monsters ranging from EvilHog's to MinoxKing's.

On Tuesdays you will find the Starter NPC in Bichon Safezone giving a Free Fox during the Invasion for any one who would like its assistance.

These Invasions take place at Sabuk Wall Gates and can only be defeated by yourself the players.
If you speak to Khin in Bichon Safezone you will get a direct teleport to Sabuk Wall with a short run to the CastleGates.

Why should you go to these Invasions?

Well aside from the obvious fun factor the Invasion monsters have enhanced EXP from those monsters you would find elsewhere in Mir. The Invasion monsters also drop Invasion Tokens which you will be able to redeem for a number of items that will aid you in hunting.
Note: This NPC will be in game shortly but Invasion Tokens can be collected now.
All monsters will give you gold and all bosses have their regular drops so you still have a chance at getting nice items.

How do the Invasions work?

When in game you will hear a shout that the RabbleRouser has been spawned.
The RabbleRouser is the trigger monster of the Invasion, If you kill this monster it will release the attacks on the Castle Gates.
There a number of spawns during the Invasions all of which are control by yourself and other players, this is done by killing the Invasion Boss, Once the Invasion Boss has been defeated further attacks will arrive at the Gates until you have successfully defeated all of the Invasion Waves.