DISCLAIMER: Your Steps and Tasks may be different
Lyllyn, Underground Forest, loc. east of the obelisk
Lyllyn is offering a bounty to anyone who will kill terracite isolationists and warriors.
From Lyllyn, head south-east to loc. 16129, 19111 to find the terracite isolationists and warriors. You can kill two of the same or one of each, it doesn't matter, as long as you retrieve 2 heads. They con blue and yellow at level 45.
Return the 2 heads to Lyllyn for your reward.
You are awarded 780,000,000 exp!
You are awarded 93 silver and some copper!
At level 45
lvl 49 received 1,100,000,000 exp (quest was originally obtained at lvl 45, not completed until lvl 49.)