Bahamut
1st: Animal Friendship, Faerie Fire
2nd: Aid, Magic Mouth
3rd: Haste, Tongues
4th: Charm Monster, Compulsion
5th: Cloud Kill, Geas

Tiamat
1st: Absorb Elements, Chromatic Orb
2nd: Dragon’s Breath, Flame Blade
3rd: Lightning Bolt, Sleet Storm
4th: Storm Sphere, Wall of Fire
5th: Cone of Cold, Immolation

Pseudo Draconism

At 1st level, your patron gifts you with a touch of draconic power. This gradually modifies your form into a being that closely resembles a dragonborn. You gain a permanent +1 to AC while unarmored or wearing light armor.

Bahamut: Empowered Strikes

Starting at 6th level, you can focus your magical talent into a single blow. As a bonus action, you can add you Charisma mod to your weapon damage for 1 minute. This feature can used an amount of times equal to your Charisma modifier + your Warlock level per short or long rest.

Bahamut: Platinum Surge

At 10th level, the power of Bahamut pulses within your veins, making you mightier than most mortals. As an Action, you can spend that action powering up. Afterwards, you gain advantage on Strength saving throws, you move twice your speed, and your weapon becomes magical for the purposes of overcoming resistance. This feature lasts for 5 minutes and after using this feature, you gain 1 level of exhaustion. This feature can only be used once per long rest.

Bahamut: Metallic Avatar

At 14th level, you become one with Bahamut on a conceptual level, elevating you to demi-god status. Due to this, you can never age by natural or magical means. You constantly radiate an aura of sanctity, giving your allies a bonus to their attack rolls equal to your spell attack modifier as long as they are within 15ft. of you and fiends cannot willingly move within this space.

 

Tiamat: Elemental Empowerment

Starting at 6th level, you can flow your magical energy through Tiamat to strengthen your spells. As a bonus action, you can add your Charisma modifier to the damage of your elemental spells for 1 minute. This feature can used an amount of times equal to your Charisma modifier + your Warlock level.

 

Tiamat: Dragon Lore

At 10th level, Tiamat confides within you ancient dragon secrets lost to the ages. Choose 2 skills to specialize in. You have proficiency in them and your proficiency bonus is doubled for any ability check you make that uses either of the chosen proficiencies. You also gain the ability to speak Draconic if you can’t already.

 

Tiamat: Chromatic Avatar

At 14th level, Tiamat sees that you are a cut above the other disciples and offers a survivable portion of her power to you. You can never age by natural or magical means. You radiate an 15ft. aura of hate wherever you go. All creatures that start their turn within the aura take 5d10 damage of your choice of either Fire, Lightning, Cold, Acid, or Poison and have disadvantage on Saving throws until they leave the aura.