D'rek

The Worm of Autumn.
worshipped as either male or female (BH UKTpb, glossary)

'Kartool's patron godess.' (BH UK Tpb, p.3)
'The Emperor's principle target had been the cult of D'rek. He'd well understood that the heart of Kartool's power was the Grand Temple, and the island's master sorcerors were the priests and preistesses of D'rek, ruled over by the Demidrek.' (BH UK Tpb, p.3)