When thrown the Toxic Grenade Mk.1 leaves a green gas cloud and deals damage over time to enemy players and the user of the grenade, if they stand it in. The damage also applies the toxic max-health reduction.
This damage can be mitigated by the Toxic Protection Gear.
In-game Description Edit
Deploys a corrosive cloud of toxic gas that lasts for 5 seconds. Targets within the 5 meter blast radius have their vision obscured and take up to 150 damage per second spent in the cloud over 5 seconds. You can only equip one.