Piecing together the patch notes:
Raid Boss + Invasions also have Leaderboards that display the top 100 players based on personal progress for that event, and will give an addition reward to those players at the end of the week.
Raid Bosses + Invasions, like Guild Wars, require tokens (called Sigils) to play each battle. Players will get Sigils each day – Sigils stack, so can be used later in the week.
The Valraven functions much like a Gnome, but only has a chance to appear in Raid Boss, Invasion, and Bounty events.
If defeated, the Valraven will give extra Sigils to continue battling in that event (Sigils given will only apply to the type of given it was encountered in, and will not carry over to the next event if unused).
Assuming that there are a lot of skilled players that all perform well, doesn’t that mean the top 100 players receiving extra rewards will be those that got lucky enough to encounter a Valraven? Because they will be able to score with, say, 35 fights instead of just the 30 most other players get?
Randomly receiving a significant amount of extra points feels very arbitrary, especially if the chance for it to happen is low. Please consider changing the Valraven to drop some goodies instead of guaranteeing a top leaderboard position. I really like the challenge of battling it out against other players, there’s just no point in doing it when you know that the deciding factor is ultimately a lucky dice roll by any other player than you, no matter how well you play.