Caladra and Aurelion – the Volcano Twins – are the patron deities of Caladraland, and some 20% of the population are devoted to them. They are the twin offspring of Lodril and Asrelia – and younger siblings to Ernalda and Maran Gor.
The cult in its current form dates to the Second Age, but is of great importance in Caladraland, and also found among the Ditali.
Twins are a matter of great magical significance in Glorantha – each of the Runic polarities can be thought of as manifestation of the cosmic Twins – and you see that a lot in the Earth Religion (Asrelia-Ty Kora Tek, Ernalda-Maran Gor, Babeester Gor-Voria). But I think Caladra and Aurelion are the most important cult where both twins are worshiped together in a single cult.
The Twin Gods combine Heat and Earth, Fertility and Harmony. They are crafters, miners, and musicians – the lyre is their instrument.
Veskarthan is just an old Kethaelan name for Lodril. After a few centuries of God Learner domination, Lodril might be the popular name. He’s the big volcano god. About 11% of the population in Caladraland follow Lodrill. The Orlanth cult is about the same size as Lodril in Caladraland (10% of the population).
Caladra and Aurelion – the Twin Gods – are actually more popular in Caladraland than Lodril – 20% of the population follow the Twins, and twins are a huge deal in Caladraland.
The most popular cult in Caladraland is…. Ernalda with some 35% of the population. She is the older sister of the Twins and worshiped as the daughter of Lodril.