$CP$ violation effects in multibody $B$ decays

$CP$ Violation is one of the necessary ingredients to produce the mat- ter anti-matter asymmetry we observe in the Universe today. The LHCb experiment is a general purpose forward-spectrometer located along the LHC proton-proton collider at CERN and is ideally suited for the in- vestigation of such phenomena. We present the latest results of 3-body charmless $B$ decays where large local $CP$ violating effects have been ob- served across various regions of the phase space. These results are discussed in the light of recent theoretical developments that attempt to understand the origin of the large asymmetries and their impact on future amplitude analyses.