From Guild Wars 2 Wiki
M-PEC is a gizmo used in the HOPE IV: The Catalyst Legendary Weapons collection.“
— In-game description
Using it grants the M-PEC Activated effect; once activated, you may engage with your enemy of interest. The enemy must be defeated while the effect is active.
- Speak with Jett in Griffonfall in southern Auric Basin to obtain the M-PEC. The area is walled off during the early stages of the Auric Basin meta, so you may need to finish some events or use advanced travel techniques from masteries to reach him.
- May burn out after use, turning it into a Burned Out M-PEC. Talk to Jett to obtain a new one if needed.
- You can obtain multiple M-PECs so long as you don't have one in your inventory.