If you're a BST or ranger, also consider the similar daytime version 'Vestal Insignia'.
The difference between the two is as follows.
Talisman of Werewolf Brain:
AC: 5
STR: +6 DEX: +3 INT: +1 AGI: +2
SV FIRE: +6 SV DISEASE: +11
DoT Shielding: +1%
Mana Regeneration: +2
Vestal Insignia:
CHA: +10 WIS: +4
SV MAGIC: +5 SV POISON: +12
Spell Shield: +1%
Strikethrough: +1%
Regeneration: +1
Damage Shield: +2