  The aim of this paper is to showcase the novel multilepton ($nl +
E\!\!\!\!/_T$, n = 3 - 5) signals, hitherto unexplored at the LHC, arising from
the heavier electroweakinos, in several generic pMSSMs at the upcoming LHC
experiments. We first briefly review our old constraints on the full
electroweakino sector of these models, containing both lighter and heavier
sparticles, using the ATLAS trilepton data from the LHC Run I. Next we derive
new stronger constraints on this sector for the first time using the ATLAS Run
II data. We identify some benchmark points and explore the prospect of
observing multilepton events in future LHC experiments. Our focus is on the
channels with $n > 3$ which are the hallmarks of the heavier electroweakinos.
If the spectrum of the lighter electroweakinos is compressed, these signals
might very well be the discovery channels of the electroweakinos at the high
luminosity LHC. We also discuss the implications of the new LHC constraints for
the observed dark matter relic density of the universe, the measured value of
the anomalous magnetic moment of the muon and the dark matter direct detection
experiments.
