Peak Fragment

is also known as .
These are earned by completing missions listed on . Each mission completed rewards at least (and possibly an additional ).
Each of the 3 items needed for can be acquired as originally intended by killing a specific mob, or by paying to . Originally, the cost was but was lowered with Patch 7.4.0.2914 on June 18th, 2020.
In the last week of August 2020 (8/24 to 8/30), you could trade (costs ) to for .