In the Demonic Dragon's lair there was a 3rd type of circle. It was unfinished and had slightly different versions of the elemental runes, the older, original kind. The same kind that appeared on Neronvain's chest.
When you were on the circle, you were almost sacrificed(?) on it. The mage Neronvain (Abyssal Lord and soon to be ruler of the Shadow Sea) said he didn’t know what kind of effect it would have on me.
(Jase tells you you can trigger your Dragon Turtle Shield manually)
Other notes:
Chuth – Invisible Assassin ruler of the Misty Forest (context? Who is this?)
Fall, Rise again (context? Was this when I was going to get sacrificed?)