College of truth

Some college of bard understand that their abilities can be used to uncover unspoken secret. Knowledge is power, but information can be false. So, bards from this college use their charisma and magic power to seek the truth. They seek the answer of any mystery and can work tirelessly to see through the lies of this world and reveal the truth. They are great investigator, and no secret is to hide for them.

Seeker of truth

At level 3, when someone use your bardic inspiration die on an Insight, Investigation or Perception check, you can regain one use of your bardic inspiration die.
You can do this a number of times equal to your Charisma modifier (a minimum of one) until needing a long rest to perform this ability again.

Plus, you can benefit from your own bardic inspiration die as long you use them for an Insight, Investigation or Perception check.

Expert investigator

At level 3, your get proficiency in Insight, Investigation or Perception and get expertise in one of this skill.

You also gain a new spell known from the divination school.
You gain one other divination spell in the same way at level 6 and two others at level 14.
These spells have to be a bard spell and doesn’t count against your spells known. (The only exception is the spell "Zone of truth". You can choose him with this feature even if it is from the enchantment school of magic)

 When you gain a level, you can replace this spell with other divination spell you can cast.

Book of knowledge

At level 6, you can reed all writing, regardless of the language. Plus, your “Seeker of truth” ability can now be use on any Intelligence check as well. You also regain all your use of the feature “Seeker of truth” on a short rest.

Eyes of truth

At level 14, you see things as they actually are, bypassing all illusion. You see invisible creatures and objects as if they were visible, and can see into the Ethereal Plane, all out to a range of 15 feet (this is basically a short range "True sight")
Plus, you now can cast any divination spell from the bard spell list without verbal, somatic and material component. You still need costly materiel component if the spell requires it.