Demon Summoning Stone - yellow-orange at 50(12k, 48k)
Dragon Minion - yellow-orange at 50 (21.8k, 8.7k)
Master Infernalist - orange at lvl 50 (12k, 48k)
Infernalist - blue-yellow at lvl 50 (12k, 48k)
These same group of mobs are found in Jamtland Mountains at (44, 38k)