Stun Grenade

Stun Grenade
Chance to stun on hit.
5% (+5% on stack) chance on hit to stun enemies for 2 seconds.
Rarity	Common
Category	Utility AIBlacklist
ID	41
Stats
Stat	Value	Stack	Add
Chance	5%	Hyperbolic	+5%

The Stun Grenade is an item in Risk of Rain 2.

On hit, it gives a 5% (+5% per stack) chance to stun most non-boss enemies, interrupting most attacks and locking them in place for 2 seconds.

Notes

• The Stun Grenade is one of the few items in the game with hyperbolic stacking.

• The chance to trigger is multiplied by the proc coefficient of the attack.

Tips

• CommandoCommandoThe Commando is a jack-of-all-trades character that is reliable in all situations of the game.
  Class: Ranged
  HP: 110 (+33 per level)
  Damage: 12 (+2.4 per level)
  Armor: 0
  Umbra: Cornered Gunslinger can utilize the Stun Grenade well, since his primary Double TapDouble Tap (Primary)Rapidly shoot an enemy for 100% damage.
  Survivor: Commando deals rapid damage with a proc coefficient of 1.0. This also makes Suppressive FireSuppressive Fire (Special)Stunning. Fire repeatedly for 100% damage per bullet. The number of shots increases with attack speed.
  Survivor: Commando irrelevant when it comes to stunning enemies, as Double Tap has no cooldown and should easily proc the Stun Grenade from time to time.
  • MUL-TMUL-TMUL-T is an aggressive survivor who has the tools necessary for any job!
    Class: Melee / Ranged
    HP: 200 (+60 per level)
    Damage: 11 (+2.2 per level)
    Armor: 12
    Umbra: Right Tool for the Wrong Job can use the Stun Grenade similarly with Auto-NailgunAuto-Nailgun (Primary)Rapidly fire nails for 70% damage. Finishes with a blast of 12 nails.
    Survivor: MUL-T, although this has a lower proc coefficient and much wider spread.
• Stunning an enemy is not considered a debuff, and thus does not contribute towards Death MarkDeath Mark
  Enemies with 4 or more debuffs are marked for death, taking bonus damage.
  Enemies with 4 or more debuffs are marked for death, increasing damage taken by 50% from all sources for 7 (+7 per stack) seconds..
• Stunning an already stunned enemy resets the time stunned back to 2 seconds rather than stacking in overall duration.

Math

The chance to activate is determined by the formula: $f(x)={\Bigl (}1-{\frac {1}{0.05x+1}}{\Bigr )}={\frac {0.05x}{0.05x+1}}$

Where $x$ is the amount.

Amount	Chance
1	4.8%
2	9.1%
3	13%
4	16.7%
5	20%
6	23.1%
7	25.9%
8	28.6%
9	31%
10	33.3%

Lore

//--AUTO-TRANSCRIPTION FROM CARGO BAY 2 OF UES [Redacted] --//
“Inventory duty. I swear, this must be the most boring position ever...” Two crewmates stood in the cargo bay, doing a routine check on the items gathered from the Contact Light’s wreckage. “Some of us are out there having adventures and fighting aliens, and I’M stuck in here counting dusty knick-knacks. What a bummer.” The other crewmate idly tapped at their device as their colleague rummaged through a container of recovered items.

“Can’t agree there. The Contact Light had millions of items in transit... It’s like a collage of people’s interests from all across the galaxy.” The other crew member scoffed. “Oh yeah? That’s really inspiring. Say, keep telling those stories, maybe it’ll make this go by quicker.”

“You just need to look at this from a different angle. There’s so much cool stuff in here! Like, for example...” The worker took something out of a container – glancing over at their colleague, the other worker stiffened.

“What the—is that a grenade!?” 

The worker laughed, tossing the dusty and dirty grenade from hand to hand. “Yeah. Don’t worry, thing was damaged in the crash. See? Completely harmless.” Holding the grenade up, a large dent was visible in its hull. “Man, I wonder what kind of model this is... I was always super interested in like, weaponry and stuff. Hm... looks to be a flashbang... old model, they don’t make these things anymore.” 

The other worker was not so thrilled. “I still don’t think you should play with that. That’s not a toy.” Squinting, the other worker realized in horror that the defunct grenade had no pin. “D-DUDE! Put that thing down, there’s no pin!”

“Huh? Oh, come on! Stop being such a buzzkill! This thing is busted beyond repair. It can’t even detonate, not even if I were to say... bang it against this table. Watch, I’ll show you.”

They were both admitted to the medical bay shortly after.

Version History

Anniversary Update

• Major Content
  • Added New Lore Entry: Stun Grenade
• Gameplay Changes
  • Added visual effect when the item procs

Early Access Artifacts Content Update

• Gameplay Changes
  • Chance to trigger now scales by proc coefficient
  • Fix Stun Grenade being able to stun certain characters with stun immunity (mainly survivors)

Early Access Scorched Acres Content Update

• Bug Fixes
  • Set interrupt priority of frozen state to be higher than stun state to fix issues with the ArtificerArtificerThe Artificer is a high burst damage survivor who excels in fighting large groups and bosses alike.
    Class: Ranged
    HP: 110 (+33 per level)
    Damage: 12 (+2.4 per level)
    Armor: 0
    Umbra: Herald of the House Beyond SnapfreezeSnapfreeze (Utility)Freezing. Create a barrier that hurts enemies for 100% damage.
    Survivor: Artificer being interrupted by Stun Grenades