Summoning of Arachnee

Acquisition
Summoning of Arachnee is learned by using a scroll

To get it, you must visit the house at 11,8. Go into the attic, and defeat the Arachnid monster that lurks there, and take the item you win (Leg of Arachnid) to the NPC downstairs. She will give you the scroll.

This is not as easy as it sounds.

The Arachnid enemies only spawn once every eight hours or so. Also, even though there are only two Arachnids in the fight to begin with, they summon more Arachnids or Arachnees. Summoned Arachnids likewise summon more enemies, so after a round or two the screen is literally filled with enemies. And whoever triggers the battle must fight them all alone.

Bring area effect spells and skills.