Binder

As a binder you have dedicated your time to seeking out how to summon entities from other planes and bind them to your will. Through research into individual demons and other extraplanar entities you hope to gain power over them, and force them to follow your commands.

Fiendish Research

You are able to research and record the names of specific fiends in your spellbook. For each CR level of the fiend, the process takes 2 hours and costs 50 gp. The cost represents material components you expend as you document your findings and make notes, as well as the fine inks you need to record it. Once you have spent this time and money, you can summon the named Fiend or fiends using a an appropriate conjuration spell and have complete control over them without the need for material components. Care must be taken when summoning in this way; if a fiend is summoned in this way and you have made a mistake in your research, it will not be under your control and will be hostile to you and your party.

Fiendish Servant

You learn the find familiar spell which you can cast without the need for material components. When you cast the find familiar spell, you summon a Fiend that does your bidding. This fiend can either be an imp or quasit and its name must be recorded in your spellbook. This fiend can adopt its true form or change to one of the forms normally available with the find familiar spell. If your familiar dies you must spend time researching a new familiar to summon and record its name in your spellbook.

Additionally, as a bonus action you can command your familiar to make one attack with its reaction.

Greater summons

When you cast a spell to summon a fiend you can expend an additional third level spell slot to increase the maximum CR of the fiend that can be summoned by two.

Focused Conjuration

While you are concentrating on a conjuration spell, your concentration can’t be broken as a result of taking damage.

Durable Summons

Any creature that you summon or create with a conjuration spell has 30 temporary hit points.