Heretical Grinder MP Glitch

Requirements

 * Heretical Grinder Shard (From Blood Grinder enemy)
 * At least 30 MP

How to perform

 * 1) Simply double tap the activation button, holding the second press.
 * 2) Only a very small amount of MP will be consumed, but the attack will proceed as normal. It will last for up to four ticks, before automatically recasting if you continue to hold.
 * 3) As an additional side effect, if you use it while jumping the effect will stay where you started it rather than follow Miriam's movement. You can still control its direction normally in the brief time it persists.

Applications
Extremely mana-efficient damage

Farming

Videos
Video demonstration

Farming Bovine Plume