The slow neutron capture (s-) process is responsible for the formation of half of the elements heavier than iron in the Universe. Despite the long time scale of this process, the long half-life of some isotopes throughout the s-process reaction flow creates branching points that lead to the division of the nucleosynthesis path. The study of the final s-process path through these branching points allows one to extract relevant information about conditions of the stellar media. In this seminar, we will see two contributions carried out, within the framework of the HYMNS ERC-funded project, in order to shed light on one of the most relevant and debated s-branching nuclei located at 79Se (t1/2 = 3.27 x 105 y).