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 May 7, 2012:
- Cornundacauda - East of Fort Zeus
- Sumima - South of East Scylla Mountains
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 August 21, 2012.
Originally Posted Here