
The Common-tier ATK rune, Uncommon rarity: base stat ATK +11 at 20 CP for 1 energy. One of the four tiers of the ATK rune line for carried items.
Common ATK Rune
Uncommon · ATK +11

Database · Runes · ATK line
The Common-tier ATK rune, Uncommon rarity: base stat ATK +11 at 20 CP for 1 energy. One of the four tiers of the ATK rune line for carried items.
Uncommon · Common tier · ATK stat line
Source
Rift System · Holo-Battle Sim
Source
Adventure Rank · Chest

The Common-tier ATK rune, Uncommon rarity: base stat ATK +11 at 20 CP for 1 energy. One of the four tiers of the ATK rune line for carried items.
Uncommon · ATK +11
The game's item data lists 2 sources for the Common ATK Rune: Rift System · Holo-Battle Sim, Adventure Rank · Chest. The Holo-Battle Sim rift is the recurring farm for every rune tier.
It grants ATK +11 as its base stat, weighs 20 CP and costs 1 energy to socket. It is the Common tier of the ATK line, whose four tiers run Common (Uncommon), standard (Rare), Advanced (Epic) and Premium (Legendary).
No published build on this site recommends the ATK line yet; the recommended-build panels on the Aniidex pages will pick it up as soon as one does.