Find and pick up the scatter item 'a huge boulder'.
It looks like this: "A giant boulder covered in ice sits here."
It weighs 9 stones and 89 pebbles, if you have Lore, you can see it is type reagent-earth.
Rewards more pracs the lower level you are. 25 in second class, 5 in 4th.
It pops in different places:
For possessing the physical ability to relieve the Lords and Ladies of Alyria of this accursed boulder, the Powers have granted thee a mark. You have been granted the Mark of Strength! You gain 42 practices! You gain 45,000 experience points!