A chatkcha was a type of exotic throwing weapon invented by the thri-kreen and unique to them.
The chatkcha was a kind of triangular throwing wedge with three piercing points. The thri-kreen carved it from a crystalline material. It could deal critical injuries to a target. A warrior needed to be highly trained to use one, as it would cut an unprotected hand, but it was much more familiar to the thri-kreen.
(Source: Forgotten Realms Wiki)
Proficiency with a Hand Crossbow allows you to add your proficiency bonus to the attack roll for any attack you make with it.
This weapon has the following mastery property. To use this property, you must have a feature that lets you use it.
Vex. If you hit a creature with this weapon and deal damage to the creature, you have Advantage on your next attack roll against that creature before the end of your next turn.
Notes: Ignore Weapon Property: Light, Ignore Weapon Property: Loading, Weapon Property: Thrown, Weapon Property: Finesse, Replace Damage Type: Slashing, Ammunition, Light, Loading, Range, Vex
Had to use finesse. Can't edit ranges like I thought you could. So if i use an axe, for strength only, I cant change the range. But if i use the hand xbow, I can use finesse for str and have the range be correct.