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		Energy BarrierEnergy BarrierSupport Category: Energy BarrierSupport Requirements: +5 IntSupports any skill that you can use, causing Energy Shield recharge to begin immediately if you are Stunned while using it.Energy Shield Recharge begins immediately and is not interrupted by Damage for 2 seconds when Stunned while using 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	Inevitable CriticalInevitable CriticalSupport Category: Inevitable Critical Tier: 3 Cost & Reservation Multiplier: 120%Support Requirements: +5 IntSupports any skill you use yourself that Hits enemies, causing it to accumulate Critical Hit chance over time.Supported Skills gain 25% increased Critical Hit Chance each second, up to 200%. This Critical Hit Chance is lost whenever a skill supported by Inevitable Critical Critically HitsPlace 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	HeftHeftSupport, Physical Category: Heft Tier: 5 Cost & Reservation Multiplier: 120%Support Requirements: +5 StrSupports Skills which deal Damage, increasing the maximum Physical Damage of their Hits.Supported Skills deal 30% more Maximum Physical Hit 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.	RuptureRuptureSupport, Physical Category: Rupture Tier: 3Support Requirements: +5 StrSupports skills that Hit Enemies. Supported skills Aggravate Bleeding on Hitting Heavily Stunned Enemies.Supported Skills Aggravate Bleeding on Hitting Heavy Stunned EnemiesPlace 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.	SupercriticalSupercriticalSupport Category: Supercritical Tier: 3Support Requirements: +5 IntSupports any skill that Hits enemies, causing it to deal more damage with Critical Hits but have less Critical Hit chance.Supported Skills have 100% increased Critical Damage Bonus Supported Skills have 20% less Critical Hit chancePlace 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
V

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.