The Power known as Hashaa holds the portfolio of death, decay, and entropy. There is no direct malevolence in her portfolio; rather, she represents the steady application of time to the grand scheme of the universe, slowly grinding it down, including living beings within it.
Hashaa has many depictions, though most of them involve skull and death imagery.
Hashaa's symbol is a stylized version of the icon that represents the passage of time (Isha-Haifaahn) within the cult language of Hasheen. It represents how death comes to all given sufficient time. It is often found inscribed upon ancient tombs and graves, or where such things are lacking, upon ruins of any great work that has fallen to the test of time.
Hasheen is a language of sounds that resembles hissing and breathing, the sounds of life - perhaps intended as an ironic twist upon the portfolio of the deity. Linguistically, it is notable that fluency within the tongue does not require that the speaker have either teeth or vocal chords.
In much the same way that Marquai applies his energy to shape the laws of the universe created by Goros to suit his immediate needs, Hashaa has taken one of the principle tools that Marquai created (Time) and applied it to the physical laws of the universe to slowly and subtly undermine the order Goros would impose upon it to bring things more in line with her vision of how the universe should be. While most of the other powers wish for a dynamic universe, Hashaa’s ultimate goal is to quiet the noisy, energetic universe and allow it – and herself – to rest in undisturbed peace and stillness. The quiet stillness and pleasant dark of night, while not directly under her portfolio, are in the mortal experience most like the conditions Hashaa would like to see, and as such, her power tends to be more pronounced at these times.
Hashaa’s influence in the Nexus is felt most directly in those who channel magic into life-extinguishing death magic; those who do so are tapping into the raw power of decay that Hashaa has woven into the universe. In this sense, death is not inherently good or evil, it is simply one more law in the universe that must be obeyed, similar to the passage of time or the pull of gravity. One of the most curious properties of this magic, however, is that those who tap into it most effectively actually inure themselves to it; to wit, they become dead to death. Scholarly debate continues over whether this was intended by Hashaa (and if so, whether it was intended as a reward or a punishment) or if it is simply a side effect of the way Hashaa poured her power through the fabric of the universe and the discovery of which surprised even Hashaa.
Haldos suggested in his writings that Breaths in which the universe was shaped by Hashaa are short-lived, though his enmity with Hashaa may make him an unreliable source. Despite her association with the undead, worlds shaped by Hashaa are inhabited by living beings during their time in existence.
The plane of Nifleheim is the realm of Hashaa, in which her ideas are made manifest without the interference of other Powers. Nifleheim is a surreal and otherworldly place whose form does not follow Goros' laws of physics or biology, which appears different in different Breaths and to different observers. Nifleheim is rarely accessible from the planes of the Nexus, and is not accessible in the present Breath nor was it in recent Breaths. It is not known what form Nifleheim presently takes.
Within the Nexus, Hashaa is primarily associated with the Undead. Revenants gain most of their power - knowingly or unknowingly - through thaumaturgical bindings that allow them to wield Her influence. Liches make no such direct pact and are ostensibly self-made, binding themselves to undeath through secrets gleaned from the dread Lore of Haldon. Still, Liches often find themselves acting in service to Hashaa's aims. Much has been speculated among Nexal scholars of what meaning the Power of Death might have in enabling magicks that allow souls to seemingly defy Her influence. Some have theorized that the Undead, rather than receiving Hashaa's Gift of Death, are a sort of fulcrum around which Hashaa's power pivots - redirecting the death that would be directed at them instead upon others, with greater amplitude and purpose for having done so.