Thief

To accomplish his goals — for good or ill — the Thief is a skilled pilferer. Cunning, nimbleness, and stealth are his hallmarks. Whether he turns his talent against innocent passersby and wealthy merchants, or against oppressors and monsters, is a choice for the Thief to make.

Class features

• May not wear armor heavier than studded leather.
• May not equip shields larger than bucklers.
• May only use the following weapons: long sword, short sword, katana, scimitar, dagger, club, quarterstaff, crossbow, shortbow, dart, sling.
• May only become Proficient in any weapon class.
• May only become Proficient in any fighting style.
• Gains 25 points per level (40 points at level 1) to distribute among the following thieving abilities: Open Locks, Pick Pockets, Find Traps, Move Silently, Hide in Shadows, Detect Illusions, Set Traps.
• May use Set Snare ability once per day per 5 levels (1 use at 1st level).
• May Backstab for increased damage:
  • Level 1–4: ×2
  • Level 5–8: ×3
  • Level 9–12: ×4
  • Level 13+: ×5
• Hit Die: d6.

Kits

• Assassin
• Bounty Hunter
• Swashbuckler

Multi-class options (non-humans)

• Fighter/Thief, Mage/Thief, Thief/Cleric, Fighter/Mage/Thief — see Multi- and Dual-Classing.

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Source: bgee/original_manuals/baldurs_gate_1_ee_mastering_melee_and_magic.pdf — "Thief".