Isobein
Isobein are the rarest of the stable Half-Elf sub-races due Islendig rarely coming into contact with Humans in their native freezing homelands. Those that are born Isobein are liable to find life in the north difficult, lacking the full benefits of their specialised parents, but are far more comfortable in the southern parts.
Ability Score: Wisdom +1, Constitution +1
Inferior Darkvision: You can see in darkness as if it is dim light for 30ft.
Inferior Cold Resilience: You reduce all Cold damage by 1d4, (minimum 1). This increases to 2d4 at the 6th level and 3d4 at the 12th level.
Arcane Attunement: Although diminished, magic is still intrinsic to the physiology of the Isobein.
You gain proficiency with the Arcana skill, this becomes expertise if gained again (this does not stack with Human Adaptability). You may use the magic within you to look into the Arcana plane, this will reveal nearby objects that are magical for 30 seconds, but for this duration you are otherwise blinded. You can only use this ability once per long rest.