Using your familiar as a conduit, your patron provides you the power to cast spells. You can cast spells using the Cast a Spell activity, and you can supply material, somatic, and verbal components when casting spells.
Prepared spells remain available to you until you cast them or until you prepare your spells again. The number of spells you can prepare is called your spell slots.
As you increase in level as a witch, your number of spell slots and the highest level of spells you can cast from spell slots increase, as shown below:
| Your Level | Cantrips | 1st | 2nd | 3rd | 4th | 5th | 6th | 7th | 8th | 9th | 10th |
| 1 | 5 | 2 | — | — | — | — | — | — | — | — | — |
| 2 | 5 | 3 | — | — | — | — | — | — | — | — | — |
| 3 | 5 | 3 | 2 | — | — | — | — | — | — | — | — |
| 4 | 5 | 3 | 3 | — | — | — | — | — | — | — | — |
| 5 | 5 | 3 | 3 | 2 | — | — | — | — | — | — | — |
| 6 | 5 | 3 | 3 | 3 | — | — | — | — | — | — | — |
| 7 | 5 | 3 | 3 | 3 | 2 | — | — | — | — | — | — |
| 8 | 5 | 3 | 3 | 3 | 3 | — | — | — | — | — | — |
| 9 | 5 | 3 | 3 | 3 | 3 | 2 | — | — | — | — | — |
| 10 | 5 | 3 | 3 | 3 | 3 | 3 | — | — | — | — | — |
| 11 | 5 | 3 | 3 | 3 | 3 | 3 | 2 | — | — | — | — |
| 12 | 5 | 3 | 3 | 3 | 3 | 3 | 3 | — | — | — | — |
| 13 | 5 | 3 | 3 | 3 | 3 | 3 | 3 | 2 | — | — | — |
| 14 | 5 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | — | — | — |
| 15 | 5 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 2 | — | — |
| 16 | 5 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | — | — |
| 17 | 5 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 2 | — |
| 18 | 5 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | — |
| 19 | 5 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 1* |
| 20 | 5 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 1* |
Some of your spells require you to attempt a spell attack roll to see how effective they are, or have your enemies roll against your spell DC (typically by attempting a saving throw). Since your key ability is Intelligence, your spell attack rolls and spell DCs use your Intelligence modifier.
Heightening Spells
When you get spell slots of 2nd level and higher, you can fill those slots with stronger versions of lower-level spells. This increases the spell's level, heightening it to match the spell slot. Many spells have specific improvements when they are heightened to certain levels.
Cantrips
Some of your spells are cantrips. A cantrip is a special type of spell that doesn't use spell slots. You can cast a cantrip at will, any number of times per day. A cantrip is automatically heightened to half your level rounded up—this is usually equal to the highest level of witch spell slot you have. For example, as a 1st-level witch, your cantrips are 1st-level spells, and as a 5th-level witch, your cantrips are 3rd-level spells.