Proficiency Slots and Check Modifiers

In the Player’s Handbook proficiency system, a character who selects a proficiency must pay a listed number of proficiency slots in order to acquire that skill. The character’s success chance equals the relevant ability score—Dexterity for the skill of tumbling, for example—modified by the proficiency’s check modifier. If you are playing with this system, use the slots and check modifiers that appear on Table 37 : Nonweapon Proficiency Groups in the PHB or the proficiency tables in this chapter.

If a character selects a proficiency that is not within his character group or the general list, he must pay an additional slot to acquire the skill.

In the PHB , the proficiency spellcraft costs 1 slot for a wizard. The check modifier is Int - 2; for a wizard with an Intelligence of 15, the success number is a 13 or less on 1d20. If the character was a fighter who wanted to be familiar with spells, spellcraft would cost 2 slots.

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