The Hildryn Einheri Collection is a Deluxe Skin bundle which contains the following items, with individual prices listed:
In Norse mythology, an Einheri (plural Einherjar; literally "army of one") is a member of the glorious dead - a warrior who has died in battle and been selected by the Valkyries to dwell in Odin's hall, Valhalla. There, they will spend the rest of time in a daily cycle - fighting to the death all day, being raised at sunset, and feasting all night - in preparation for the universe-ending battle of Ragnarok. The Brising Syandana is a reference to the dwarf-made golden necklace Brisingamen, owned by the goddess Freyja. Freyja, in addition to the conventional goddess purviews of love and beauty, is also a goddess of war (though to be fair, so is most of the Norse pantheon) - in fact, half of the Valkyrie's battle-dead go not to Valhalla, but to Freyja's hall (or possibly ship) Sessrumnir, in the field Folkvangr. This may indicate that the Hildryn Einheri Skin represents an Einheri belonging to Freyja's host, rather than one of Odin's.
The Blodgard Heavy Blade Skin does not appear to have any mythological significance, but it does sound cool.