Hood of the Weave
Very Rare
Arcane Enchantment: You gain a +2 bonus to Spell Save DC and spell 
attack rolls.
Worn by the wizard Tenser when he was inducted into the Circle of Eight. After the ceremony in which his fellow wizards Otiluke and Bigby played a trick on Tenser, the two pranksters found their party vodkas spiked with a spell that transformed their earlobes into cynical pixies.
How to obtain
Act 3 Purchase Lower City
