Maelstrom — Jonathan Christopher

The keys have been taken; three of them just when Drac thought he almost had Yvik Dardarious beaten, only one more he'd told Pimpie and then we can finally defeat him. Now he had to recover the three the Drakheyen had taken from him and find Maelstrom, the fouth key. He needed weapons, powerful weapons to face Aludra and he hoped the fourth keysword would be, if not enough to wrest the swords from her at least a help as he and his companions entered her lair--the Vault of Ages and faced the terrors, the horrors there.