The 4th Bloodstone Theory

We do go back, as Leon pointed out, for Olias. That is based during the time of Nightfall's beginning (3 years after the White Mantle's Inner Circle's fall)

Ah, right. All of my characters had already claimed Olias (and Zenmai) before that quest was introduced, so I'd completely forgotten about it...

I'm fully in support of the bloodstone having landed on the penisula of Orr, which now sits mostly underwater. In GW2 when the dragon raises the penisula again we may have the answer.

You know, I just had a thought...

We've been assuming the Bloodstones were flung out more-or-less randomly. What if their landing sites in fact weren't entirely random, but each was pulled the a thematically appropriate location (the Preservation stone being attracted to a life-filled jungle and so on)?

This would mean that it's at least less likely that there's an underwater Bloodstone (except possibly in some sunken location like Orr) as the ocean may not have anything to attract a volcano-launched Bloodstone... or at the least, a Bloodstone launched in a direction where it might be expected to land underwater might be drawn to an island as a more 'suitable' landing place.

How do you argue the believed Aggression bloodstone landing in the Bloodstone Caves - what drew the bloodstone there?

Also, due to a conversation with someone, I recalled a past thought: It is possible that the Hallowed Point is a bloodstone - though no environmental effect (unless the sulfur being deadly is the effect - the source of that is still unknown afterall) and no knowledge of it being one, it is still possible.

If it is, then the range would almost be doubled.

Hard to say, without knowing exactly where the bloodstone is on the map, when it landed, and what was happening there. There's a lot of fighting around it now (the frogmen in the nearby dungeon, the dwarves, possibly the Dredge and Norn in GW2...) but we don't know how much of this is cause or effect (or, depending on how the Bloodstones interact with time, both - the Aggression bloodstone may have been attracted to the Shiverpeaks because there would be a lot of fighting there, rather than there being a lot of fighting there because of the presence of a bloodstone).

If the Hallowed Point is a bloodstone, it would probably be Destruction or Denial - the former to destroy the Staff, the latter to deny it to those who would (mis)use it. The sulphur would suggest Destruction, if it wasn't there since before the bloodstones spewed out... although it could be that the creation of the Desolation attracted the Destruction bloodstone, and then its presence resulted in the expansion of the sulphur dunes (from memory, I think there was a mention of the sulphur having spread over time...).