With the recent maintenance Premium Dungeon mobs can drop Infinity Atma.
For players that don't know :
Infinity Atma can be used to compound quest Temperion Models to make them stronger, are required to make 35/75% mounts, and you can make 3%/6%/9% reinforce/enchant/compound success rate xeons (by compounding the 1% success rate xeons that you can buy at Nova Lux). They are also used for other various compounds.
The drop rate from PD is higher than Haunted Mine.
P.S : ElfLord pushed a lot for this idea so make sure to thanks him and Helium that made the change.
Edited by Kazara, 07 September 2016 - 02:46 PM.