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About Black tourmaline core
"The blackened heart of the Grotesque Guardians."
Black tourmaline core combines with Bandos boots to create Guardian boots, currently best-in-slot tank boots. Dropped 2-per-kill at 1/1,000 by the Grotesque Guardians on the Slayer Tower rooftop (75 Slayer).
Item Details
Item ID21730
MembersYes
Store Value41,500gp
High Alch24,900gp
Low Alch16,600gp
GE Limit5 / 4h
Item Information
Released2017-10-26
UpdateGrotesque Guardians
Weight1 kg
TradeableYes
StackableNo
NoteableYes
EquipableNo
Quest itemNo
AlchableYes
DestroyDrop
OptionsUseDrop
Creation Recipes
CombineLevel
Materials:
Bandos bootsBlack tourmaline core
Drop Sources
| Source | Combat | Qty | Rate | Rarity |
|---|---|---|---|---|
| Grotesque Guardians | — | 2 | — | 1/1000 |
Used in production (1)
| Product | Skill | Lvl | XP | Qty |
|---|---|---|---|---|
| Guardian boots | Smithing | 0 | 0 | 1 |
History (1)
- 2017-10-26
Released with the Grotesque Guardians update.
Market Strategy
- Sole drop source is Grotesque Guardians (1/1,000 for 2), so supply is bound to Slayer Tower rooftop activity.
- Low daily volume (~93) — patient market making beats trying to flip fast.
- Demand is upgrade-driven; Guardian boots BiS status keeps long-term floor.
Trading Tips
Margin equation = Guardian boots price minus Bandos boots — buy core when that gap exceeds GE ask.
Watch Slayer task buffs or Grotesque Guardians changes for supply shocks.