Sentence:  Men said that the garden had been roofed over against the sun with great sheets of lead and copper, leaving no cranny through which the tiniest star could peer down. Some swore that the privacy of its masters during their visits was ensured by a <WSD>lethean</WSD> slumber which Dwerulas, through his magic art, was wont to lay at such times upon the whole vicinity. 
Meaning of the word marked with <WSD> tags:  Of or relating to death or forgetfulness.