I usually don't like fanfictions which mix powers of another animes, like use chackra in One Piece. However, I'll give a try, I made some exceptions, since a few of them are pretty good.
theTripleX_HSA
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LIKETo be honest, chakra can exist in one piece due to it being the merging of physical and spiritual energies. Although Observation and Conquerors Haki is solely representative of spiritual energy, armament haki is different. Since one requires a sufficiently strong body to practice Armament Haki, then it means it is just a more crude (yet simple = powerful) version of combining physical and spiritual energy. Chakra can technically be created and greatly strengthen the power of the 3 colors of Haki
Abdul_Syed:To be honest, chakra can exist in one piece due to it being the merging of physical and spiritual energies. Although Observation and Conquerors Haki is solely representative of spiritual energy, armament haki is different. Since one requires a sufficiently strong body to practice Armament Haki, then it means it is just a more crude (yet simple = powerful) version of combining physical and spiritual energy. Chakra can technically be created and greatly strengthen the power of the 3 colors of Haki