Sanguine Tome drop rate?

[Bolas]

I've camped this about four hours so far, saw the Tae Ew fiend spawn one time, and he dropped.... Tae Ew letter's Sword. BLEAH.

Is Sanguine Tome the rare? The common drop? The uncommon drop? Are they all equally rare? Anyone know?

-Bolas

[tnexus]

It's his common drop, gotten it 3 times compared to the sword once.

[Bolas]

Got sword once, tome once. Now JUST need firebone notebook for the phylactery.

-Bolas

[papyscott]

Fairly common drop. Book is at least a 50-50 bet in my experience.

papy

[Faerwynd]

Got the sword 6x before I got a book. Common experience from what other friends have told me.