Requirements:
80 Prayer
40KC

Tips:
Bring anti poison potions/venomblood perk.
Stand at the north-most mask. This forces poison buff ghost.
Pray range.
I wouldn't bring melee unless you know how greg works.

But Gaz. Where is Greg?
Good question, Greg is located in GWD2. Once entered run north east until you've reached the boss instance. Easy as that.

Date:  20th September

Time:  20:00 Game time

FC:  Gazzy

World:  21 is LS world right? 21 I think we'll see.

will try and make this