Have been killing these for quite a while and have yet to see a lt blue one at 70. Even my 70 druid, using track, is unable to locate a lt blue seething mist or steam drake.
As noted above, they can quad and triple often and stuns seems to happen a little more often than I have found with other mobs this level. Most can be pulled single if you time them correctly. I have seen hits in the high 700s from the seething drakes and Dranadune (named) in the mid 800s.
I have yet to see a ruby with 100+ kills. Hopeful though.
Tiggoi 70 War
Tremil 70 Dru
Sapium 69 Clr
Oaus 69 Bst
Layla 68 Shm
Laroux 66 Mag
and so on...
The Nameless (formerly Inny server)