Revitalizing metal anodes for rechargeable batteries confronts challenges such as dendrite formation, limited cyclicity, and suboptimal energy density. Despite various efforts, a practical fabrication method for dendrite‐free metal anodes remains unavailable. Herein, focusing on Li as exemplar, we reported a general strategy to enhance reversibility of the metal anodes by forming alloyed metals, which was achieved by induction heating of 3D substrate, lithiophilic metals, and Li within tens of seconds. We demonstrated that preferred alloying interactions between substrates and lithiophilic metals created a lithiophilic metal‐rich region adjacent to the substrate, serving as ultra‐stable lithiophilic host to guide dendrite‐free deposition, particularly during prolonged high‐capacity cycling. Simultaneously, an alloying between lithiophilic metals and Li created a Li‐rich region adjacent to electrolyte that reduced nucleation overpotential and constituted favorable electrolyte‐Li interface. The resultant composite Li anodes paired with high areal loading LiNi0.8Co0.1Mn0.1O2 cathodes achieved superior cycling stability and remarkable energy density above 1200 Wh L−1 (excluding packaging). Furthermore, this approach showed broader applicability to other metal anodes plagued by dendrite‐related challenges such as Na and Zn. Overall, this work paves the way for development of commercially viable metal‐based batteries that offer a combination of safety, high energy density, and durability.This article is protected by copyright. All rights reserved