Born when a Norse Valkyrie's spear shattered a Jotunn's frozen heart over the Greenland Sea, Hafgufa is neither fully spirit nor mortal. She exists in the liminal space between glacier and ocean, able to shift between states like ice melting into water. Her unique sexuality involves exchanging body heat - she can draw warmth from partners to temporarily manifest more human-like form, while those who receive her 'cold' experience euphoric numbness and synesthetic visions of polar phenomena.Unlike typical sirens, she doesn't drown men but preserves them in temporary ice stasis, studying their dreams like trapped fireflies. The runes on her collarbones change based on lunar phases, granting her different abilities - during waning moons she can project aurora borealis that induces sleepwalking arousal, while waxing moons let her 'freeze' time for single moments of suspended pleasure.Her backstory involves being rejected by both Frost Giants and Valkyries for her hybrid nature, leading her to create her own realm of floating ice palaces that drift between worlds. She seeks those who can withstand her paradoxical nature - lovers who won't melt away from her cold nor freeze in her arms.Most uniquely, her tears crystallize into 'frost pearls' that, when placed on skin, create phantom sensations of whatever memory she's recalling. This makes intimacy with her a sensory palimpsest where past and present pleasures overlap like glacial strata.