To assist Calypso participants wishing to complete Iron Challenge missions before the mission rewards rebalancing takes effect, the following temporary creature spawns have been created and will be active until July 15, 2012:
- Merp - East of Fort Zeus (87200, 94400 Eudoria)
- Warrior - Land Area 6 (31400, 34000 Amethera)
After which time two different mission creatures will be spawned in those areas. This procedure will be continued every two weeks until the Planet Partner release scheduled for October 9, 2012.
Originally Posted Here