Diviner (Mage Kit)

A wizard who specializes in detection and divining magic.

Advantages

• May memorize one additional spell per level per day.
• Full access to True Sight, Wizard Eye, Foresight, etc.

Disadvantages

• Opposed School: Conjuration/Summoning — may not learn any summoning spells.

When to pick it

• Losing all summons (Monster Summoning, Mordenkainen's Sword, the late-game Planetar) is a major cost. The Diviner specialist is rarely chosen as a result.

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Source: bg2ee/original_manuals/baldurs_gate_2_ee_mastering_melee_and_magic.pdf — "Specialist Mages" → "Diviner".