School of Secrets

Wizards from the School of Secrets often act as spies or keepers of secrets, hence their taste for a more subtle magic than some of their colleagues. The wizard that is introduced to this path may not be the most spectacular, but that's their job not be. They have a tendancy to discretion, and might even be able to hide amongst the common folks for a long period of time.

Silent One

Starting at level 2, if a spell requires verbal or somatic components, you can ignore either while launching the spell. You can use this ability a number of time equal to your Intelligence modifier (minimum once). All expended uses are restored on a long rest.

Keeper of Secrets

Starting at level 2, your training has given you the ability to resist torture and spells trying to extract the truth from you;  you have advantage on Wisdom saving throws.

In Sheep's Clothing

Starting at level 6, if you do not know it already, you learn the spell Disguise Self. You can cast this spell at will, without expanding any spell slots nor using any component.

Cypher

Starting at level 10, you know arcanic ways of coding a message. If anyone but people you allow to read it try to decypher your code, they can only do so by magical means, and only on a successful Intelligence check against your spell DC.

This also works for your spellbook, which aditionnally takes double the time to copy spells from for anyone but you.

Finally, your knowledge of codes makes it half as long to copy spells into your own spellbook.

Silent and Still

Starting at level 14, when using the Silent One capability, you can ignore both verbal and somatic components.