Quazarith can generate at y -192 or lower in a uniform distribution.
It only generates exposed to air in veins from 1-3.
When mined Quazarith drops Quazarith pieces (fortune is applied)
Upgrading tools
First you will need to craft a Flumrock Cauldron
Next you will need to find Kryslum in a structure or at the bottom of the world and collect quite a bit (a bucket for each slot your tool or armor takes in the crafting table)
Put the Kryslum in the Flumrock Cauldron
Add Crux and Quazarith
Finally right click your Netherite tools or armor on the cauldron
Notes:
The amount of Quazarith and Crux needed to upgrade it depends on the amount of slots the main material takes up in the crafting table
helmet cost = 5
chestplate cost = 8
leggings cost = 7
boots cost = 4
shovel cost = 1
pickaxe cost = 3
…
A Flumrock Cauldron can store a maximum of 12 Crux, Quazarith Pieces and Kryslum Buckets