Corporal Beast is one of the bigger bosses on the server. It's a little hard to kill. But not invincible. Its combat level is 785. You can find the Corporal Beast by using the Boss Teleport System.
If you are a new player in Dreamscape i would not recommend the Corporeal Beast because of his VERY high Hitpoints, the best way to kill the Corporeal Beast is by killing him with High End Gear like Dream Mage Set or Dream Range Set with a Eternal Khione Staff, BFG9000 or M4A4 Asiimov.
You can still try to kill the Corporeal Beast with lower tiered gear but it will take you a very long time to kill it!
The Corporal Beast does NOT drop souls that can be crafted into soul keys, therefore it still maintains the common and uncommon drops. The corporal beast, along with all other NPC's in Dreamscape, drop Key Fragments and Treasure Chests .