User blog comment:Swampman/SPOILERS----- Arisen Timeline/Speculation/@comment-74.112.37.90-20120626032242

A few things

All the arisen still around either gave their life for their pawn (Selene's master), fought the dragon and failed (Dragonforged), took the dragon's offer (Edmun), defeated the dragon but died to the Seneschal (became the new dragon or are possibly used to revive The Dragon, we don't know who the Arisen was to become the current dragon, but it's clear this happens if you let the Seneschal kill you), defeated the dragon AND THEN they defeated the Seneschal becoming a Seneschal themselves (Savan).

Also, Grigori is just his speculated name. Nothing truly confirmed.