Cliff Golems

[Kesselring]

If you can successfully pull the general dark elf guy too (who is kind of an easy shadow knight and doesn't hit hard) he also drops spells, he drops them at a better rate than cliff golems too.

As far as I know level 60 mobs can drop down to level 55 spells, and level 56-59 can drop level 60 spells all the way down to level 54 (never seen a jugg drop a level 53 spell, but have seen them drop level 60 ones albeit very rarely).