
The Common-tier M.DEF rune, Uncommon rarity: base stat M.DEF +16 at 20 CP for 1 energy. One of the four tiers of the M.DEF rune line for carried items.
Common M.DEF Rune
Uncommon · M.DEF +16

Database · Runes · M.DEF line
The Common-tier M.DEF rune, Uncommon rarity: base stat M.DEF +16 at 20 CP for 1 energy. One of the four tiers of the M.DEF rune line for carried items.
Uncommon · Common tier · M.DEF stat line
Source
Rift System · Holo-Battle Sim
Source
Adventure Rank · Chest

The Common-tier M.DEF rune, Uncommon rarity: base stat M.DEF +16 at 20 CP for 1 energy. One of the four tiers of the M.DEF rune line for carried items.
Uncommon · M.DEF +16
The game's item data lists 2 sources for the Common M.DEF Rune: Rift System · Holo-Battle Sim, Adventure Rank · Chest. The Holo-Battle Sim rift is the recurring farm for every rune tier.
It grants M.DEF +16 as its base stat, weighs 20 CP and costs 1 energy to socket. It is the Common tier of the M.DEF line, whose four tiers run Common (Uncommon), standard (Rare), Advanced (Epic) and Premium (Legendary).
No published build on this site recommends the M.DEF line yet; the recommended-build panels on the Aniidex pages will pick it up as soon as one does.