It seems to me that they should be parastical in some way to fuel their immortality. Yet the suggestion that they use Tap doesn't quite cut it for me as it frankly is passe (every evil wizard and his dog uses it as do the Brithini et al).
I would divide the Blue Vadeli into two groups. The first are the Old Ones who managed to shift themselves to the Other Side when Zzabur's Great Spell sunk their land. Since because of their nature and the fact that they have remained on the Other Side for so long, means they can only manifest on the mundane world with difficulty. They can easily manifest themselves at the Axis Mundi. Once manifested they can only remain for a limited time before the spell expires and they are drawn back to the Other Side. Certain rituals can prolong their stay but these consume time which can be spent on more productive tasks.
The others are the New Ones. They are descendants of the Old Ones who were born in Jrustela. They have been protected by the Browns who rule parts of (Human) Jrustela and have recieved tuition from their parents. Since they are very young (the oldest would be thirty or so), the need for immortality rituals has not yet taken manic proportions that marked the excesses of the Vadeli Empire at its Zenith.
I'm thinking that the Blues need to capture the souls of their victims into themselves so they could feed of the energies to keep them immortal/onslaughtian/etc. As time goes by, the victim's souls will be expended and they'll have to hunt for more.
End of Glorantha Digest V2 #571
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