  We study the signs of criticality in conserved charge fluctuations and
related observables of finite temperature QCD at vanishing chemical potential,
as we approach the chiral limit of two light quarks. Our calculations have been
performed on gauge ensembles generated using Highly Improved Staggered Quark
(HISQ) fermion action, with pion masses ranging from 140 MeV to 55 MeV.
