The OSR version of Book of Valkyries is slowly nearing completion. I've enjoyed digging into Norse, and greater germanic mythology for research. The stat blocks I've been using are closest to BECMI (because of the expanded ability score table) with a few modern touches such as ascending AC and including a Base Attack Bonus, and also dual axis alignment.
Geirdriful
Valkyrie of Flinging Spears
Demi-Goddess, Medium Humanoid, Neutral Good
Armor Class: 18
Hit Dice: 10 (45 hp)
Base Hit Bonus: +7
Attacks: 2 spears (1d8+3 dam. each)
Move: 60' (20') / 180' (60') flying
Save: D12 W11 P10 B13 S14 (F10)
Morale: 11
XP: 2,500
TT: D
Str: 18/+3 Dex: 16/+2 Con: 15/+1
Int: 14/+1 Wis: 16/+2 Chr: 18/+3
Spear Mastery: Geirdriful can throw her spears with perfect accuracy up to 120'.
Divine Resilience: Immune to charm and fear effects.
Geirdriful (“Spear Flinger”) has golden hair and gleaming armor as she soars through the skies. Her eyes, sharp and focused, miss nothing in the chaos of battle. Geirdriful wields a half dozen ornate spears, each imbued with the power to strike true from any distance.