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Rich physics can be divined from charged black holes subjected to extremalconditions. When applied in conjunction with principles like Weak CosmicCensorship, this naturally leads to constraints on the mass and charge of theblack hole. However, more nuanced principles such as the Weak GravityConjecture (WGC) and the recently proposed Festina-Lente (FL) bound canprovide, respectively, upper and lower bounds on elementary charged particles.In this study, we examine the quasinormal modes (QNMs) exhibited by a massivescalar test field carrying an electric charge, oscillating in the outer regionof the black hole. These modes are subjected to the constraints imposed by theFL and WGC bounds. Our analysis provides insight into the behaviour of QNMs,particularly in regions that approach the extremal conditions of the blackhole. Notably, in these regimes, the stability of the modes becomes precarious,particularly in the presence of a positive cosmological constant. Theimplications of our findings are far-reaching and significant. They extend fromsafeguarding the principles of cosmic censorship to addressing the structuralstability of the black hole's interior. Our semi-classical analysis presentscompelling evidence suggesting that Strong Cosmic Censorship may be violatedfor black holes that are in close proximity to extremality within the contextof Reissner-Nordstr\"om-de Sitter (RNdS) geometries.

Reissner-Nordstr\"om black holes in de Sitter space-time: bounds with quasinormal frequencies