DISCLAIMER: Your Steps and Tasks may be different
1) Speak with Sister Rhigwyn in the Camelot Church. She will send you to see Sir Benitt in Castle Sauvage.
2) Sir Benitt will ask you to retrieve a glacial hammer from the Hill Scrag camp west of Castle Myrddin in Snowdonia, loc 17934, 56818.
3)No hammer will drop when you kill the Scrag, the journal tells you to return to Sir Benitt.
4)Sir Benitt will now tell you that you need to go to the the Snow/Penn pass to get the hammer from a Snowdon Grim (loc= 40,50), kill him, still no hammer, return to Sir Benitt. (Note: another task possibility given to get the hammer has been to kill a Cornish Giant,loc=11129, 29272 Cornwall and another mob given is a Gytrash loc= 21418,11817,8049 dir=246 Pennine Mountains night spawn only 12am-6am)
5)Sir Benitt will now send you to kill a grave goblin in the Barrows. Once again no hammer, return to Sir Benitt.
6)Finally he will tell you that it is Dash (only spawns at night, loc=22k, 11k Pennine Mountains. More info: Location of quest mob Dash is south of Caer Boldiam Tower 3, by the grimwoods and the cockatrices, at loc 21418, 11817, 8049. The gytrash spawn between midnight and 6am.) you need to kill in Pennine Mountains. Kill Dash and you will get the Glacial Long Hammer.
7)Bring the hammer to Sister Rhigwyn and she will reward you with 63.5 million in experience, and given the option to keep the hammer as a normal hammer or a polearm.