On this page
- Overview: What Explosive Grenade Does
- Core Mechanics: Bounce, Fuse, Cooldown and Heat
- Key Properties and Acquisition
- Recommended Support Gems
- Role and Differences Across Builds
- Common Mistakes: Why It Misses and Damage Fluctuates
- Video Demo and Timestamps
- Frequently Asked Questions
- Changelog
- Sources and Verification
Overview: What Explosive Grenade Does
Explosive Grenade is a grenade-type skill (common in the Crossbow system): you throw a grenade that bounces along the ground, and after a fuse timer it explodes dealing fire area damage and leaving an igniting (ignite) ground that keeps burning. The most misunderstood part is players thinking 'it explodes immediately on throw' — actually the landing point and detonation timing are key.
It converts 80% of physical damage to fire, so the core value comes from fire damage, ignite and area, not physical direct hit. It also carries the Detonator tag: other skills (like Fragmentation Rounds) can detonate it early, actively controlling the explosion timing.
Because it is a Cooldown / charges-driven skill, it shares rhythm with the crossbow Heat system and ammo skills. Understanding the timeline 'bounce → fuse → explode → ignite ground' turns it from 'random throws that miss' into a reliable AoE and sustained Burn source.
- Essence: grenade attack + bounce + fuse detonation + fire AoE + ignite ground.
- 80% phys-to-fire: value from fire damage, ignite and area.
- Detonator tag: can be pre-detonated by Fragmentation Rounds etc.
- Cooldown / charges-driven, shares rhythm with crossbow Heat system.
Core Mechanics: Bounce, Fuse, Cooldown and Heat
Bounce and fuse: after thrown the grenade bounces along terrain and only explodes after a fixed fuse timer. This means both the 'landing point' and the 'detonation moment' can be altered by bouncing — which is the root cause of newbies feeling 'it always bounces out of the boss area'. Predicting the landing and using a short fuse or proactive detonation is far more effective than blind throwing.
Cooldown / charges: Explosive Grenade usually has charges and a cooldown, not infinite throws. Treat it as a resource to periodically lay AoE / Burn, not mindless spam. Plan how many to lay when charges are full.
Detonator synergy: grenades with the Detonator tag can be pre-detonated by specific skills (like Fragmentation Rounds). Proactive detonation lets you explode precisely when monsters cluster or during a boss break window, instead of waiting for the natural fuse. This is the key to turning Grenade from 'passive wait' into 'controlled burst'.
80% phys-to-fire and Heat: most damage converts to fire, so stacking fire damage / fire penetration is more effective than physical. The crossbow Heat system accumulates heat with some skills; once heat reaches a threshold it may grant extra fire damage or overload effects — Heat is a buff source, not a mandatory burden, but managing it well keeps the extra fire damage triggering steadily.
- Bounce changes landing, fuse decides explosion moment; predict the landing.
- Has charges / Cooldown, manage as a periodic resource.
- Detonator: proactively detonate with Fragmentation Rounds to control timing.
- Heat is a buff (extra fire damage), not a mandatory burden, but manage it.
- 0.5.1 fixed a Quality projectile-related bug; old video projectile behaviour may be outdated.
Key Properties and Acquisition
- Skill type
- Active Attack (Grenade / Crossbow)
- Tagged attack, grenade, fire, aoe, duration, crossbow.
- Weapon requirement
- Crossbow (mainly)
- Common in crossbow systems; shares rhythm with ammo skills and Heat system.
- Acquisition
- Uncut Skill Gem
- Unlockable early in the campaign; core AoE for crossbow leagues like Witchhunter.
- Detonation
- Auto fuse / Detonator proactive
- Defaults to fuse explosion; can be pre-detonated by Fragmentation Rounds etc.
- Quality
- Trajectory / area or extra effect
- High quality usually improves trajectory / area or some effect; 0.5.1 fixed a Quality projectile bug.
Recommended Support Gems
- Fire Penetration
- Core
- Directly amplifies fire damage, a core support for fire grenades.
- Especially important on high-fire-resist maps / bosses late.
- Magnified Area
- Core
- Widens explosion and ignite ground area, improving clear coverage.
- Lower value on boss single-target than on clear.
- Elemental Armament
- Core
- Provides multiple elemental bonuses and buffs, broadly stable.
- Useful whether physical- or fire-oriented.
- Martial Tempo
- Core
- Provides attack / skill speed, improving throw rhythm and coverage frequency.
- A crossbow-skill universal core.
- Demolish
- Situational
- Synergises with Detonator, proactively controlling detonation timing — key to controlled burst.
- Needs a skill that can detonate (like Fragmentation Rounds).
- Heavy Shells
- Situational
- Increases explosion area or damage, leaning toward clear and coverage.
- Use when budget is higher.
- Fire Infusion
- Situational
- Strengthens fire damage / ignite scaling, fitting 80% phys-to-fire.
- Fire-version core; meaningless on non-fire versions.
- Immolate
- Optional
- Boosts ignite damage, strengthening the ignite ground's sustained Burn.
- Only worthwhile on ignite-dependent routes.
Role and Differences Across Builds
Witchhunter (Crossbow): the most typical Explosive Grenade carrier. Witchhunter's ascendancy emphasises damage amp and utility tools against 'marked / executed' enemies, pairing with the crossbow detonation and Heat systems to make Grenade a reliable AoE and Burn source. In 0.5 Witchhunter is strong, and Grenade is its clear and burn-laying主力.
Mapping vs Boss difference: while mapping you can throw several, use bounce to cover packs, and pair Magnified Area for large ignite coverage; on boss the unstable landing is the main pain point — switch to a short fuse or proactive detonation (Detonator) to explode precisely in the break window instead of waiting for the natural fuse.
Relationship with Fragmentation Rounds: skills like Fragmentation can pre-detonate grenades, acting as the Grenade playstyle's 'detonator'. Whether you treat Grenade as 'area-laying' or 'a bomb to be detonated' depends on whether you plug into this detonation chain.
- Witchhunter: Grenade is clear and burn-laying主力, with Heat / detonation.
- Clear: multiple + bounce + large ignite; Boss: short fuse / proactive detonation.
- Fragmentation Rounds is Grenade's detonator, deciding the playstyle shape.
Common Mistakes: Why It Misses and Damage Fluctuates
Landing always bounces out of boss area: grenades bounce, blind throws at the boss's feet will bounce away. Predict the bounce, or switch to a short fuse / proactive detonation to explode precisely in the cluster window.
Damage suddenly much higher: usually Heat hitting the threshold triggers extra fire damage, or you just detonated with Detonator in a break window. Understand this is mechanic, not random, to reproduce it stably.
Is Heat mandatory or optional: Heat is a buff source (extra fire damage / overload), not a burden; but you do need to manage it to trigger steadily. Don't sacrifice key defenses for Heat.
Is Payload worth the longer Cooldown: Payload-type supports extend the effect but lengthen the cooldown; whether it's worth it depends on whether you lean sustained area-laying or burst — lean sustained on clear, weigh on burst boss.
Can multiple hits hit the same target: yes, but limited by charges / Cooldown; rather than stacking count, use proactive detonation to fully land a single grenade's damage on a key target.
- Problem: can't hit boss. Direct answer: predict bounce, short fuse or proactive detonation.
- Problem: fluctuating damage. Direct answer: Heat threshold or break-window detonation, mechanic not random.
- Problem: must I manage Heat. Direct answer: it's a buff not a burden, but manage it.
- Problem: is Payload worth it. Direct answer: lean sustained on clear, weigh on burst boss.
Video Demo and Timestamps
doomguyashenone
0.3.0 Witchhunter Strong Demo (incl. Grenade system)
Covers Witchhunter strength in 0.3.0 and the actual feel of the grenade / crossbow system, useful for understanding Grenade's role in the crossbow system.
What to watch for: Watch grenade area-laying and detonation timing, and the overall crossbow-system rhythm (note 0.3 vs 0.5 differences; numbers follow the current client).
Open source ↗Frequently Asked Questions
Why does the grenade always bounce away and miss?
After thrown the grenade bounces along terrain, its landing altered by bouncing.
Predict the landing, or switch to a short fuse / proactive detonation (Detonator) to control the explosion position.
Is Heat mandatory to stack?
Heat is a buff source (extra fire damage / overload), not a burden.
But it needs management to trigger steadily; don't sacrifice defense for Heat.
How do I proactively detonate the grenade?
Explosive Grenade carries the Detonator tag, pre-detonatable by skills like Fragmentation Rounds.
After plugging into the detonation chain, you can explode precisely in the break window instead of waiting for the fuse.
How should I use grenades in boss fights?
Boss landing is unstable; use short fuse or proactive detonation to explode in the cluster / break window.
Rather than stacking count, fully land a single grenade's damage on the key target.
Changelog
- Initial release: bounce / fuse, Cooldown charges, Detonator detonation, 80% phys-to-fire, Heat value and common failures.
Sources and Verification
GGG official forum Patch Notes and announcements, used to confirm 0.5 / 0.5.1 adjustments to grenades, the Quality projectile bug and the Heat system.
PoE2DB and Community Wiki provide tags, weapon requirement, mana cost, level scaling and hidden behaviour fields.
doomguyashenone's Witchhunter 0.3.0 demo and Mobalytics' Grenade build, cross-verifying grenade's role in the crossbow system and detonation timing.
Reddit, official forum and comments surface real issues like 'bounces away, fluctuating damage, is Heat mandatory, is Payload worth it', reproduced on the client and answered directly.
Related content
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