1. Where & How to Summon Grigoire

Location: Grigoire is found in the Hall of the Penitent, located in the Dry Steppes near Ked Bardu.

Summoning Cost: You need Living Steel to summon him at the Light-Touched Altar.

World Tier 3: 2 Living Steel required.

World Tier 4: 5 Living Steel needed.

Where to Get Living Steel: Farming Helltide chests is the main way — the Tortured Gifts of Living Steel drop Living Steel.

2. Prepare Your Build & Gear

Lightning Resistance: Since most of Grigoire’s attacks are lightning-based, boost your lightning resist via gear, topaz gems, and Diablo 4 Items.

Mobility Is Key: Choose gear or skills that help you move quickly. Dodging lightning attacks and repositioning often is crucial.

Sustain: Bring healing potions, and consider defensive cooldowns or shields to mitigate his burst phases.

3. Phases & Attack Patterns

Here’s what to expect from Grigoire’s attacks and how to handle them:

Phase 1

Lightning Grid / Platform Attacks: The ground will “light up” in a grid pattern before Grigoire lands or uses his attacks.

Tip: Watch for the red-marked tiles, then dodge to safe zones immediately.

Mace Swings + Lightning Orbs: He swings his electrified mace and may release bouncing lightning orbs.

Tip: Stay behind him when possible — his frontal swings are his most dangerous melee attack.

Phase 2

Electric Pillars / Walls: Lightning pylons appear, connecting in arcs and creating damaging walls or zones.

Tip: Avoid these walls — they electrify and deal heavy damage. Use movement skills to reposition.

Summons – Knight Penitents: He can summon knights to fight alongside him.

Tip: Use AoE attacks to clear them quickly while staying aware of ground hazards.

Phase 3

Grid Explosions: More ground tiles begin to explode in a pattern, making safe movement harder.

Tip: Move to safe tiles when possible. Watch for wind-up animations to predict when tiles will explode.

Heavy Lightning Burst: Grigoire may use a powerful lightning strike or “Galvanic Ascendance” that changes the arena’s pattern.

Tip: Be ready to dodge or use defensive cooldowns when this pattern begins.

4. General Strategy & Tips

Maintain Distance Early: In the first phase, stay back to avoid his melee orbs and build-up attacks.

Position Behind Him: His most damaging attacks are frontal — getting behind him mitigates a lot of risk.

Use AoE Wisely: When knights spawn, use your AoE or multi-target skills, but don’t sacrifice positioning.

Watch the Ground: Never stand still in later phases — electrical hazards will punish you if you do.

Use Movement Skills: Teleport, dash, or any mobility tool will be highly valuable for avoiding dangerous attacks.

Manage Your Cooldowns: Save your strongest abilities or defensive spells for his heavy telegraphed attacks or phase transitions.

5. Loot & Rewards From Grigoire

Defeating Grigoire rewards you with valuable items and materials:

Unique & Class-Specific Items: Grigoire can drop class-unique gear depending on your build.

Shard of Agony: A special drop that can be used for other boss mechanics.

Mythic Uniques: On Tormented (high) difficulty, there is a higher chance to get mythic-tier items.

Mount Armor Cosmetic: The Demonbinder Mount Armor is a possible cosmetic drop from Grigoire.

6. Advanced Tips & Tricks

Team Up: Grigoire is much easier to take down in a group — shared damage and mechanics awareness help a lot.

Use Lightning Resistance Consumables: Potions or temporary buffs increase your survivability dramatically.

Practice Dodging: The grid and bolt attacks are predictable — learning their patterns is key.

Retry Often: Because summoning requires Living Steel, don’t be discouraged by failure; run Helltides to farm more.

Build for Bossing: If possible, tweak your build before the fight (e.g., more resist, more mobility) instead of your “map build.”

7. Common Mistakes to Avoid

Charging in too aggressively, especially in Phase 1.

Ignoring resistance — lightning damage is his main source.

Failing to clear the knight adds quickly, which complicates positioning.

Standing in risky tiles when you should be moving — especially in the “grid” phases.

Wasting mobility or defensive cooldowns early — save them for big attacks.

Final Thoughts

Grigoire, The Galvanic Saint, is one of buy Diablo 4 Items most engaging and rewarding pinnacle bosses. With his mix of lightning-based attacks, ground hazards, and summoned minions, the fight tests both your positioning and your ability to adapt.

By preparing properly — stocking lightning resist, using movement wisely, and timing your cooldowns — you can consistently defeat him, unlock his hoard, and farm his unique rewards.