You have practiced casting spells in the midst of combat, learning techniques that grant you the following benefits:

• Increase the chosen ability score by 1, to a maximum of 20.
• You can perform the somatic and material components of spells even when you have weapons or a shield in one or both hands provided the spell does not consume the materials.
• When a hostile creature's movement provokes an opportunity attack from you, you can use your reaction to cast a spell at the creature, rather than making an opportunity attack. The spell must have a casting time of 1 action and must target only that creature.