In this seminar, I would like to briefly introduce myself (as I am new here) and the projects I have been working on. I will present the advanced extended Public ESO Spectroscopic Survey of Transient Objects (ePESSTO+) programme. It has gathered the ESO community working on supernovae and unusual transients into one coherent team, developed efficient synergies with multi-messenger experiments and revolutionised the exploitation of wide-field surveys. I was PI of GROND supernova projects, and thus I will focus on the transients followed-up by the ePESSTO and GROND collaboration, which represent the extreme (e.g. the brightest superluminous supernovae or the fastest kilonova) of the luminosity-space of cosmic transients, providing a new dataset to understand their nature. Finally, I will also present the scientific goals of my Marie Skłodowska-Curie fellowship on photometric and spectroscopic sample study of kilonovae with ENGRAVE.