Trial: Defeat a set number of experience-yielding monsters under the prescribed weather conditions, or on the corresponding day of the week.
Objective: 50 monsters of any family.
Equipment: Teiwaz must be equipped.
Wait for Firesday, grab a melee buddy, equip your staff, and go to town. Personally, I did a Teleport-Vahzl, went up to Uleguerand Range, and killed the tigers, bunnies, and snolls and was done in about 20 minutes. Very abundant kills, all giving experience points to lvl 99.