Personally, I wonder if it has anything to do with the crystal shards that keep falling from the sky in the pavillion. Considering the Queen’s history with Kralkatorrik, and especially after watching the Wooden Potatoes video linked above, I personally suspect that the Aetherblades are not from Tyria, or rather…not from ‘our Tyria’ (as implied in WP’s video). It makes sense to me that perhaps Kralkatorrik, what with his mesmer skills and what not, was responsible for ripping apart reality due to their consumption of magic.
(Gah, edited for clarity. Apologies.)
Those are searing crystals. From the searing cauldron. That Sparcus activates as part of his event. They have exactly nothing to do with Kralkatorrik. At all.