One thing which still sits with me after reading is the connection between the Rift / Dragonkin power / Effigies, that is definitely something I'll be interested to read more information on.
The original Wise Old Man
This is great, actually learned some things I didn't even know. Is there a place where Jagex keeps all the Lore Campfires? I really should go read through some of them again.
We sleep soundly in our beds because rough men stand ready in the night to visit violence on those who would do us harm.
I think most of the assumptions were fine, except for the part which states that those old Water Lizards are the Wyrms exactly.
Not just because Kerapac names them differently, but mainly due to the fact that the QBD breathing fire naturally seems to be something new, worthy of mentioning. She was a heir to both those lizards and the kin, so if both were already able to breathe fire naturally it should be surprise that she could too.
Not to mention that I see no reason why aquatic creatures such as these Water Lizards would have had any use for breathing fire... in the water they lived in.
I would guess that the Wyrms are instead a dragonkin's creation, made by a lazier work of the Kin simply working to mutate the natural Water Lizards into extra powers (such as fire-breathing and maybe flying), and possibly the blind servitude to their new masters.