Stone Body (ストーンボディ,Sutōn Bodi) and the similar Iron Body (アイアンボディ,Aian Bodi) and Metal Body (メタルボディ,Metaru Bodi) are effects from the Mega Man Battle Network and Mega Man Star Force series that turns the user's body into stone or other highly resistant material to become immune against attacks. However, a side effect of this high defense is that the user is unable to move while transformed, possibly due to the material's weight. Enemies and bosses like Gaia, KnightMan.EXE and Mono Sword use this effect, only changing to normal and becoming vulnerable while attacking. Break type attacks are able to bypass this effect, causing higher damage than usual.
In early Mega Man Battle Network games, Stone Body also appears as a Battle Chip that temporarily gives this effect to a NetNavi.