Beauty and Grace. Dau are small, agile, and beautiful creatures. Both male and female dau have dark, shoulder-length hair generally adorned with shining baubles. Dark brown eyes draw forth warmth and excitement. Their bright glittering wings vary in shades of green and blue, which they sometimes augment with contrasting jewelry.
Dau are only slightly taller than gnomes and halflings and possess slender builds, allowing them to maneuver with a catlike grace, both in the air and on the ground. Their fey blood keeps them physically fit, even though they generally choose lavish, lazy lifestyles if they can.
Home and Hospitality. When dau are able to settle down and enjoy lifestyles of luxury, they always do. Utilizing their magical and deceptive talents only makes their lives easier. Their hedonism attracts many and varied people, offering them even more opportunities to enjoy life. Dau choose not to use their talents to harm or inflict cruelty, seeking rather to enjoy life with others. Beware, however, those who would breach their rules of hospitality.
Dau Traits
Ability Score Increase. Your Charisma score increases by 2, and your Dexterity score increases by 1.
Age. You reach maturity by the age of 75. Your average life span is expected to be around 125–150.
Alignment. You are likely either neutral or chaotic good. Your mischievous, whimsical, and lazy behavior creates a lot of uncertainty for those around you. The world means only as much to you as the wealthy, lavish, and hedonistic lifestyle it can provide. But your drive for that extraordinary life propels you.
Languages. You can speak, read, and write in Sylvan and Common. You may also choose 1 extra language including: Primordial and Deep Speech.
Size. You are 3–4 feet tall and weigh no more than 50 pounds. Your size is small.
Speed. You have a walking speed of 20 feet and a flying speed of 60 feet as long as you are wearing nothing heavier than light armor.
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Darkvision. You are accustomed to the darkness of the desert night sky; you have superior vision in dark and dim conditions. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can’t discern color in darkness, only shades of gray.
Illusory Awareness. You have advantage on saving throws against illusion magic.
Magically Deceptive. Once per long rest, you may cast the detect thoughts spell. When you reach 3rd level, you may also cast the mirror image spell, and upon reaching 5th level, you may cast the invisibility spell. Charisma is your spellcasting ability for these spells.
Masters of Manipulation. You have proficiency with the Deception skill.
Tangible Illusion. Once per long rest, after casting an illusion spell of an object that is no larger than 5 cubic feet, you can transform it into a normal, non-magical object. The temporary object lasts for 10 minutes after which it reverts to being an illusion (or vanishes if the duration of the original illusion expires).
Telepathy. You can communicate telepathically with any creature within 60 feet of you. You do not need to share a language with them.
Find out more about the dau and other monsters in the Tome of Beasts.
So… Tangible Illusion can be used with minor illusion to create diamonds that can be used as spell components?