Bonestorm

BonestormSpell, AoE, Projectile, Sustained, Physical, Channelling
Tier: 5
Level: (1-20)
Cost: (6-69) Mana per second
Cast Time: 0.12 sec
Critical Strike Chance: 15.00%Channel to conjure a swarm of bone spikes in the air, then release to fire them at enemies and explode. Shrapnel Impales Enemies Hit, causing subsequent Attack Hits against those targets to deal extra Damage. Consumes your Power Charges to cause much larger explosions.Deals (4-109) to (7-164) Physical Damage
200% more Impale Magnitude
Impale on Spell Hit
Modifers to cast speed also affect this skill's cost
Can fire up to 20 Projectiles

Additional Effects From 1-20% Quality:
(0.5-10)% more Cast SpeedSkills can be managed in the Skills Panel.

Acquisition
Drop restricted
It can be obtained by engraving an Uncut Skill Gem.Metadata
Item class: Skill Gem
Metadata ID: Metadata/Items/Gem/SkillGemBonestorm

Bonestorm is a channelling physical spell. While channeling, the spell generates bone spikes. Releasing the channel will fire all bone spikes at the target location, dealing damage in an area and applying Impale on hit. This skill consumes power charges to increase the area of effect.

Skill functions and interactions

Bonestorm projectiles deal area damage on impact in a small explosion.

adds two additional projectiles per channelling tick rather than the default one.

Gem level progression

Level		Mana Cost	Physical Damage
1	0	395	4 to 7
2	3	447	6 to 9
3	6	505	8 to 12
4	10	572	11 to 16
5	14	647	13 to 20
6	18	733	16 to 25
7	22	829	20 to 30
8	26	939	23 to 35
9	31	1062	27 to 41
10	36	1202	32 to 48
11	41	1361	37 to 55
12	46	1540	42 to 63
13	52	1743	48 to 72
14	58	1972	54 to 82
15	64	2232	61 to 92
16	66	2526	69 to 104
17	72	2859	78 to 117
18	78	3236	87 to 131
19	84	3662	98 to 146
20	90	4144	109 to 164

Recommended support gems

The following support gems are recommendations by GGG as listed in-game, and do not necessarily reflect optimal combinations or the views of the wiki.

Gem tier	Support gems
I	Brutality IBrutality ISupport, Physical Category: Brutality Tier: 1 Cost & Reservation Multiplier: 120%Support Requirements: +5 StrSupports any skill that deals damage, boosting its Physical damage at the expense of all other Damage Types.Supported Skills deal 25% more Physical Damage Supported Skills deal no Chaos Damage Supported Skills deal no Elemental DamagePlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.	Perpetual ChargePerpetual ChargeSupport Category: Perpetual Charge Tier: 1 Cost & Reservation Multiplier: 130%Support Requirements: +5 DexSupports skills that consume Power, Frenzy or Endurance Charges on use, giving them a chance not to remove each Charge while still gaining the benefits of consuming them.Supported Skills have 25% chance to not remove Charges but still count as consuming themPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.	Steadfast ISteadfast ISupport, Channelling Category: Steadfast Tier: 1 Cost & Reservation Multiplier: 110%Support Requirements: +5 StrSupports Channelling Skills you use yourself, granting you higher Stun Threshold while Channelling them.You have 50% more Stun Threshold while Channelling Supported SkillsPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
II	Armour Break IArmour Break ISupport, Physical Category: Armour Break Tier: 2Support Requirements: +5 StrSupports Skills that Hit Enemies, causing those Hits to Break Armour based on a portion of Physical Damage dealt.Break Armour equal to 15% of Physical Damage dealt by Supported SkillPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.	Brutality IIBrutality IISupport, Physical Category: Brutality Tier: 2 Cost & Reservation Multiplier: 120%Support Requirements: +5 StrSupports any skill that deals damage, boosting its Physical damage at the expense of all other Damage Types.Supported Skills deal 30% more Physical Damage Supported Skills deal no Chaos Damage Supported Skills deal no Elemental DamagePlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.	Ricochet IRicochet ISupport, Projectile Category: Ricochet Tier: 2Support Requirements: +5 DexSupports any Skill which creates Projectiles, giving those Projectiles a chance to Chain when impacting terrain.Projectiles from Supported Skills have 40% chance to Chain an additional time from terrainPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
III	ExtractionExtractionSupport, Spell Category: Extraction Tier: 3Support Requirements: +5 IntSupports Spell Skills which cause Damaging Hits. Using supported Spells will cause you to Sacrifice a portion of your Life on use, gaining extra Chaos Damage in exchange. Does not support Persistent Skills, Minion Skills, or Triggered Skills.Supported Skills Gain 35% of Damage as extra Chaos Damage Supported Skills Sacrifice 10% of Life on usePlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.	Wildshards IWildshards ISupport, Spell, Projectile Category: Additional Projectiles Tier: 3 Cost & Reservation Multiplier: 120%Support Requirements: +5 IntSupports Projectile Spells. Supported Spells have a chance to fire many additional Projectiles in a circle.Supported Skills have a 20% chance to fire 8 additional Projectiles in a circlePlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.	Zenith IIZenith IISupport, Spell Category: Zenith Tier: 3 Cost & Reservation Multiplier: 120%Support Requirements: +5 IntSupports Spell Skills. Supported Skills deal more damage while you are above 90% of your Maximum Mana, and Recoup a portion of Skill costs as Mana. Does not modify Skills used by Minions.25% of Supported Skills costs are Recouped as Mana Supported Spells deal 30% more Damage while you are above 90% of your Maximum ManaPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
IV	Burgeon IIBurgeon IISupport, Channelling Category: Burgeon Tier: 4 Cost & Reservation Multiplier: 120%Support Requirements: +5 IntSupports Channelling Skills you use yourself, causing them to deal more damage the longer they have been Channelled.Supported Skills deal 20% more Damage per second spent Channelling, up to 40%Place into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.	Nova ProjectilesNova ProjectilesSupport, Projectile Category: Additional Projectiles Tier: 4Support Requirements: +5 DexSupports Projectile Skills, making them fire extra Projectiles in a circle, at the cost of Damage. Does not support Skills which rain down Projectiles from above.Supported Skills fire 4 additional Projectiles Supported Skills fire Projectiles in a circle Supported Skills deal 40% less DamagePlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.	Rapid Casting IIRapid Casting IISupport, Spell Category: Rapid Casting Tier: 4Support Requirements: +5 IntSupports Spells, causing them to cast faster.Supported Skills have 20% increased Cast SpeedPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.
V	Brutality IIIBrutality IIISupport, Physical Category: Brutality Tier: 5 Cost & Reservation Multiplier: 120%Support Requirements: +5 StrSupports any skill that deals damage, boosting its Physical damage at the expense of all other Damage Types, as well as giving Hits from that skill a chance to ignore Physical Damage reduction.Supported Skills deal 30% more Physical Damage Supported Skills deal no Chaos Damage Supported Skills deal no Elemental Damage Hits with Supported Skills have 20% chance to ignore Enemy Physical Damage reductionPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.	Physical MasteryPhysical MasterySupport, Physical Category: Mastery Tier: 5Support Requirements: +5 IntSupports Physical skills, granting them an additional level. Does not support skills which do not have levels.+1 to Level of Supported Physical SkillsPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.	Ricochet IIIRicochet IIISupport, Projectile Category: Ricochet Tier: 5Support Requirements: +5 DexSupports any Skill which creates Projectiles, causing those Projectiles to Chain when impacting terrain, at the cost of any additional Projectiles, as well as causing them to always Pierce.Projectiles from Supported Skills Pierce all Targets Modifiers granting additional Projectiles instead cause Projectiles from Supported Skills to Chain an additional time from terrain per Projectile they would have gainedPlace into a Skill's Support Gem socket in the Skills Panel to apply its effects to that Skill. You cannot have multiple Support Gems of the same Category socketed within one Skill.

Item acquisition

Bonestorm has restrictions on where or how it can drop.

It can be obtained by engraving an Uncut Skill Gem.

Alternate skill effects

Bonestorm has the following alternate skill effects:

Item	Description

Version history

Version	Changes
0.3.0	The base damage scaling of all player spell and secondary damage skills has been tweaked to scale better in the late game. Generally speaking, spells that do not have damage number changes called out below will have near-identical base damage at low levels, roughly 5% more damage at gem level 20, and roughly 20% more damage at gem level 30.
0.2.0	Many Skills have had their base damage and/or damage growth per level rebalanced. Most of these changes are not specifically mentioned below as the changes are too widespread. Bonestorm's shrapnel has become a general mechanic called Impale, similar to the Impale mechanic from Path of Exile 1. Hits that Impale an enemy cause the next attack hit against that enemy to gain added physical damage equal to 30% of the physical damage dealt by the impaling hit. Bonestorm now Impales on hit instead of applying a specialised debuff, and has 200% more Impale magnitude.
0.1.0e	Increased the damage growth per level on Unearth (non-Minion component), Bonestorm, Bone Cage, Bone Blast (Wand Skill) and Power Siphon (Wand Skill). Results in approximately 50% more damage at Gem Level 25.
0.1.0d	Updated the suggested Supports for Bonestorm.
0.1.0	Introduced to the game.