One Big Plot Hole
Dagar the Invincible #11 would have been one of the better issues in the series, if it weren't for one big plot problem.
Jesse Santos' art is about as good as it normally gets, which although far from fantastic, is suitable for the job at hand. The issue has another great cover (probably by Gold Key's house cover artist George Wilson).
And Don Glut's story of a primordial-ooze-turned-monster is one of the more interesting adversaries the barbarian hero has fought. But the story claims that an ancient erected a set of monuments to track the time of year via the moon (sort of like Stonehenge), and that the moonlight shining through the holes in these monuments somehow passed through a crack in the earth and awakened the monster once a year... but if that's the case, the moonlight would've awoken the same monster once a year even before the monuments existed, as the light just passes through a series of holes, not lenses, and is not bent in any direction... it still would have passed through the crack in the earth without them present.
Clearly some idea was lost between conception and page. If you can overlook that fairly large plot hole, which should be immediately obvious to anyone reading the issue, then you may be able to enjoy "It Lurks by Moonlight" for the standard Lovecraft inspired sword and sorcery tale that it is.