You learn to use the properties of languages as you know to alter your incantations. When you cast a spell that involve a verbal component, you can choose one of the following effects. You can only use effects tied to languages you are proficient with.

Abyssal. When you cast a spell that requires concentration, you gain resistance against cold, fire, and lightning damage while you are concentrating on the spell.

Celestial. When you cast a spell that restores hit points to a creature other than you, you regain hit points equal to the spell's level + your spellcasting modifier.

Deep Speech. If you fail the check to maintain concentration of a spell, each creatures within 5 feet of you takes 1d6 psychic damage for each level of spell slot used to cast the spell.

Draconic. When you cast a spell that requires concentration, you gain a number of temporary hit points equal to the spell's level + your spellcasting modifier, which last until you stop concentrating on the spell.

Giant. When you cast a spell that involves one or more ranged spell attacks, you can instead turn all of them into melee spell attacks with range of 5 ft.

Infernal. When you cast a spell that involves a melee or ranged spell attack that targets a single creature, you can infuse it with hellish energy. On a hit, any healing the target receives until the start of your next turn is reduced by 1d4 for each level of spell slot used to cast the spell.

Auran. When you cast a spell that requires concentration, your movement speed increases by 5 feet for each level of spell slot used to cast the spell while you are concentrating on the spell.

Aquan. When you cast a spell that requires concentration, you gain the ability to walk across liquid surfaces while you are concentrating on the spell.

Ignan. When you cast a spell that requires concentration, you can shroud yourself with flames. While you maintain concentration on that spell, a creature that touches you or hits you with a melee attack while within 5 feet of you takes fire damage equal to the spell's level + your spellcasting modifier.

Terran. When you cast a spell that requires concentration, you can strenthen your connection to the ground. While you maintain concentration on that spell and are standing on earth or stone, you cannot be pushed or knocked prone.

Sylvan. When you cast a spell while within 60 feet of a plant, you cast the spell as though you were in the plant's space, using your own senses.