Magic stones that spill from slain Magic Beasts, each holding the singular skill of whatever creature it came from. Shattering one lets a Hunter claim that ability, which makes the stones coveted the world over.
Living up to their name, these stones fall from defeated Magic Beasts and lock away the dead creature's own distinctive ability. By breaking the stone a Hunter can take that skill for themselves, and once their value became common knowledge, the stones grew into highly sought commodities that grant their holder a decisive advantage on the battlefield.
Thanks to the System, Sung Jinwoo holds a privilege no ordinary Hunter shares. Off Kang Taeshik he managed to pull a Rune Stone, despite the fact that Taeshik was no Magic Beast at all but a target he had been assigned to defeat; he then collected Ruler's Hands from Igris and Shadow Exchange from Baran as additional mission spoils. A limit exists, though, on how many skills one body can carry. Woo Jinchul, who held onto his memories once the world was wound back by the Cup of Reincarnation, leaned on his foreknowledge to stockpile skills as a substitute for lacking S-Rank status, only to begin dying because even an A-Rank cannot contain them all.
A few particular stones are worth singling out. The one from Kang Taeshik bestowed Stealth, allowing its user to merge with the environment and erase every trace of their presence, physical and magical alike. Igris' stone offered Ruler's Hands, sometimes rendered Dominator's Touch, a telekinetic gift later shown to be a weaker version of the Rulers' Ruler's Authority. Baran's contained Shadow Exchange, which trades the user's position with a shadow over any distance. Kamish's gave Dragon's Fear, a mana-charged roar that hurls anyone weaker than the user, allies among them, into terror and despair.

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Rune Stones are magic stones that spill from slain Magic Beasts, each holding the singular skill of whatever creature it came from. Shattering one lets a Hunter claim that ability for themselves, which makes the stones coveted the world over.
Thanks to the System, Sung Jinwoo could break Rune Stones to absorb their skills. He pulled one from Kang Taeshik to gain Stealth, then collected Ruler's Hands from Igris and Shadow Exchange from Baran as additional mission spoils.
Yes, a Hunter's body can only carry a finite number of skills. Woo Jinchul stockpiled Rune Stone skills using his foreknowledge after the world was reset, but began dying because even an A-Rank cannot contain them all.
Kang Taeshik's stone gave Stealth, Igris' gave Ruler's Hands, a telekinetic gift, Baran's gave Shadow Exchange for swapping places with a shadow over any distance, and Kamish's gave Dragon's Fear, a mana-charged roar that hurls weaker beings into terror.
Once their power to bestow a slain creature's distinctive ability became common knowledge, Rune Stones grew into highly sought commodities, since they grant their holder a decisive advantage on the battlefield.
Looking for more on Rune Stones? The Solo Leveling Wiki on Fandom has a dedicated page with community notes.
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