Goodreads Librarians Group discussion

This is the 1977 Sphere reprint edition (originally published in the UK by Sphere in 1973). The text on the back cover, as I have it, is:

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WARLOCK BLADE IS THIRSTY!
HOWLING IN ITS HUNGER,
HEWS IT THROUGH THE IRON,
SINGS IN CLOVEN SKULLBONES,
SLAKES ITSELF IN BLOODSTREAMS.

The hideous war between the Elf Kingdom and the cold lands of the Trolls embroiled Elfland in its bloodiest battle. And the only hope of the faery folk was the half-human deathbringer Skafloc.

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Thanks, Matthew