Artificer is a class that specializes in the use of magic. In order to cast spells, an artificer must first spend spell slots.
Spell slots are a resource that an artificer uses to cast spells. The number of spell slots an artificer has is determined by their level.
An artificer begins play with four spell slots. As they increase in level, they gain additional spell slots.
For every two levels beyond 1st, an artificer gains one additional spell slot. For instance, a 4th-level artificer would have five spell slots, a 5th-level artificer would have six spell slots, and so on.
When an artificer casts a spell, they must expend a number of spell slots equal to the level of the spell being cast. The number of unused spell slots returned to the artificer’s inventory at the end of each day is equal to 2 + their Intelligence modifier.
An artificer’s base attack bonus (and thus their chance to hit with melee attacks) is equal to their level divided by 3. This means that a 1st-level artificer has a base attack bonus of 0, a 2nd-level artificer has a base attack bonus of 1/3, and so on.