This thin crystal is placed over the eyeball of an arcane caster. When worn, it grants the wearer insight which allows him or her to cast particularly effective spells. With each spell cast, the caster may choose one effect from the following list of enhancements:
- +1 Spellsurge (critical hit chance)
- +2 spell penetration
- +2 to save DC
- Reroll all “1”s on damage dice
The selection must be declared prior to casting.
Additionally, the Lens grants a +4 to Spellcraft and Knowledge (Arcane) checks.