Black Marble Battle Idol Valheim 1.0.20
Black Marble Battle Idol is a material found in the Plains biome in Valheim. It is used to craft Himminafl and Skull Splittur.
“This mysterious idol is brimming with the potential of the gods. It could grant a powerful boon, or demand a great sacrifice.”
The Black Marble Battle Idol is a material that first becomes available in Ashlands. The game describes it as a mysterious idol brimming with the potential of the gods, one that could grant a powerful boon or demand a great sacrifice. It weighs 0.5, stacks up to 20, and can be teleported.
You use it as an ingredient when crafting several weapons: Himminafl, Skull Splittur, Spinesnap, Arbalest, Demolisher, Carapace Spear and Splitnir. It is also needed for three variants of that last weapon: Splitnir the Bleeding, Splitnir the Storming and Splitnir the Primal.
Used to craft
Arbalest, 
Carapace Spear, 
Dead Raiser, 
Demolisher, 
Himminafl, 
Krom, 
Mistwalker, 
Skull Splittur, 
Spinesnap, 
Splitnir, 
Splitnir the Bleeding, 
Splitnir the Primal, 
Splitnir the Storming, 
Staff of Embers, 
Staff of Frost, 
Staff of Protection.
Other material items
Acorns, 
Amber, 
Amber Pearl, 
Ancient Bark, 
Ancient Coin, 
Ancient Metal, 
Ashlands Gourmet Bowl, 
Ashwood, 
Asksvin Bladder, 
Asksvin Hide, 
Asksvin Neck, 
Asksvin Pelvis.