Tier level seperation
You are right for the MOST part. However, T5 drops all the way to 80 starting out at 60. T6 mats are a super rare chance off of anything that has a chance to drop a t5 mat. This is also effected by the level of the mob, so say for example( purely made up drop rates) a level 70 skelk has a 5% chance to drop a Potent blood (T5)and a .02% chance to drop a powerful(T6). A level 80 Skelk has a 10% chance to drop a Potent blood and a 1% chance to drop Powerful. That’s just based off my findings, and since we can’t actually mine the drop rates, it very well may vary on person to person and the amount of time they are in the “farming” zone, due to to anti0farm script.