  Recent wide-area surveys have enabled us to study the Milky Way with
unprecedented detail. Its inner regions, hidden behind dust and gas, have been
partially unveiled with the arrival of near-IR photometric and spectroscopic
datasets. Among recent discoveries, there is a population of low-mass globular
clusters, known to be missing, especially towards the Galactic bulge. In this
work, five new low-luminosity globular clusters located towards the bulge area
are presented. They were discovered by searching for groups in the
multi-dimensional space of coordinates, colours, and proper motions from the
Gaia EDR3 catalogue and later confirmed with deeper VVV survey near-IR
photometry. The clusters show well-defined red-giant branches and, in some
cases, horizontal branches with their members forming a dynamically coherent
structure in proper motion space. Four of them were confirmed by spectroscopic
follow-up with the MUSE instrument on the ESO VLT. Photometric parameters were
derived, and when available, metallicities, radial velocities and orbits were
determined. The new clusters Gran 1 and 5 are bulge globular clusters, while
Gran 2, 3, and 4 present halo-like properties. Preliminary orbits indicate that
Gran 1 might be related to the Main Progenitor, or the so-called ''low-energy''
group, while Gran 2, 3 and 5 appear to follow the Gaia-Enceladus-Sausage. This
study demonstrates that the Gaia proper motions, combined with the
spectroscopic follow-up and colour-magnitude diagrams, are required to confirm
the nature of cluster candidates towards the inner Galaxy. High stellar
crowding and differential extinction may hide other low-luminosity clusters.
