Median triaxiality of the DM halos of the wCDM models from the DUSTGRAIN-pathfinder simulations (with or without neutrinos), as function of the non-linear fluctuations of the cosmic matter field, σ_NL. All the curves are superimposed, which means that the cosmological dependence of the mass-triaxiality relations is once again completely encapsulated in the non-linear power spectrum, as was highlighted in Alimi & Koskas (2024).