Sky Spire is the endgame tower in Broken Blade, and it sits right in front of the Jotunheim central pillar. It gates the materials you need for late-game scaling, including Holy Grails for Excalibur, Soul Stones for Soul Forge, and the best rune drops in the game. The fastest farm is not about brute force; it is about meeting the entry cost, bringing enough damage, and pushing the layers that actually pay out.
Quick answer: Farm 30 Sky Keys from Jotunheim bosses, enter Sky Spire at the Jotunheim pillar, then push Layer 81–90 for the highest-value rune drops and tower materials.
Sky Spire entry requirements in Broken Blade
You cannot walk into Sky Spire on raw progress alone. You need keys, and you need a weapon that can clear high-HP targets quickly. The tower rewards consistent clears, so the goal is a build that kills fast rather than one that barely survives.
| Requirement | Detail |
|---|---|
| Entry cost | 30 Sky Keys to open the tower |
| Location | In front of the Jotunheim central pillar |
| Recommended weapon | Max Mythril / Diamond Dragon Slayer or a strong Buster setup |
| Luck setup | Equip a luck title such as Godblade Forger before farming |
Tip: Godblade Forger gives around 30% luck and only requires forging 100 low-tier weapons at an early forge. The game counts the forge action, not the weapon quality, so use trash materials and repeat until you hit 100.
How to farm 30 Sky Keys fast
Sky Spire farming route and best layers
Once you are inside, the tower floors hand out Holy Grails, Soul Stones, and tower materials. For rune farming specifically, push to the upper layers where the high-value drops appear.
- Enter Sky Spire at the Jotunheim pillar with 30 Sky Keys.
- Push Layer 81–90 for the strongest rune drops.
- Farm tower floors for Holy Grails and Soul Stones along the way.
Shadow Clone is the safest rune to chase here because it gives consistent damage and farming output. Crit is also excellent if your build already attacks fast or scales burst well, so pick based on how your weapon already behaves.
Sky Spire rewards and where they go
| Reward | Source | Use |
|---|---|---|
| Holy Grails | Sky Spire floors | Excalibur craft, with 100 reported as the target |
| Soul Stones | Sky Spire floors and Jotunheim mobs | Soul Forge upgrades on the pillar 2F |
| High-value runes | Layer 81–90 | Major late-game damage boost |
| Tower materials | Sky Spire floors | Endgame weapon progression |
The Jotunheim pillar ties the whole loop together. Soul Forge sits on 2F, the Excalibur Forge is on 3F, and the Piece Shop for Buster Pieces and Sword Pieces is on 4F. That means your Sky Spire drops feed directly into the forges a few steps away.
How to confirm the farm is working
You know the loop is paying out when your Sky Key count climbs from boss clears and the tower opens once you hit 30. Inside, your Holy Grail and Soul Stone totals should rise per floor, and rune drops appear as you push deeper into Layer 81–90. If those counters stall, your damage is the bottleneck.
The most common reasons the farm slows down are a weak weapon, a missing luck title, and skipped upgrade systems. Max your Dragon Slayer on Volcano Island, equip Godblade Forger before you grind, and check Soul Forge stats, since many players forget it even when their weapon level looks fine. Fixing those three things turns slow tower runs into a repeatable farm that pushes you toward Excalibur.
