GRP Weapon Guide in The Callisto Protocol
What is a GRP?
GRP stands for Gravity Restraint Projector and it is a miniaturized graviton field generator used by UJC Correctional Officers to pacify inmates and manipulate objects.
It also requires a GRP Battery Pack to recharge the power meter.
Please note that this page is undergoing updates.
How to Get GRP
During Chapter 3, once you have reached the Medical Ward C101. A cutscene will play as Jacob approaches a corpse that has a GRP attached to it, a short conversation between Elias and Jacob will play as he is wearing the GRP on his arm.
All GRP Weapon Upgrades
| Upgrade Name | Details | Cost |
|---|---|---|
| Energy Upgrade – Small | Increases the maximum energy capacity with aftermarket expansion cells. | 300 Callisto Credits |
| GRP Velocity Upgrade – Small | Increases launch strength by removing safeties. Target can be injured upon impact. | 300 Callisto Credits |
| GRP Recharge Speed Upgrade – Small | Increases the GRP recharge rate via additional heat sinks. | 300 Callisto Credits |
| Energy Upgrade – Medium | Increases the GRP’s max energy capacity. | 900 Callisto Credits |
| GRP Recharge Speed Upgrade – Medium | Improves the GRP’s recharge rate. | 900 Callisto Credits |
| GRP Velocity Upgrade – Medium | Further increases the GRP’s launch strength. Targets can be grievously injured including limb loss. | 900 Callisto Credits |
| Energy Upgrade – Max | Maxes out the GRP’s energy capacity. | 2700 Callisto Credits |
| GRP Recharge Speed Upgrade – Max | Maxes out the GRP’s recharge rate. | 2700 Callisto Credits |
| GRP Velocity Upgrade – Max | Maxes out the GRP’s launch strength. Target can impact at near fatal speeds. | 2700 Callisto Credits |
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