Monstrous Monday: Gwragedd Annwn

An old favorite for today's Monstrous Monday.  The Swanmay from Monster Manual II featured heavily in my Ravenloft games of late First Ed and Early 2nd Ed. 
While there are creatures like these found all over Europe, it is the Welsh Gwragedd Annwn that remains my favorite.  Though not 100% the same as the Swanmay, it is close enough for my liking.

Here she is for Old-School Essentials.

swan maiden by liga-marta

Gwragedd Annwn (swan-maidens)
Human maidens capable of turning into a swan. They only have this power while they remain unmarried.

Armor Class 7 [12]
Hit Dice 2 or more (9 hp)
Attacks 1 weapon (by weapon type)
THAC0 19 [+1]
Movement Rate 120’ (40’) or 150’ (50’) swim or 180’ (60’) flying
Saves D12 W13 P14 B15 S16 (2)
Morale 10
Alignment Lawful
XP for Defeating 25
Number Appearing 1 (1d4+1)
Treasure Type U (A)

• Enemy of Evil. Gwragedd Annwn are fierce enemies of evil and chaos and fight it wherever they can.
• Rangers. All Gwragedd Annwn are rangers of level equal to their HD. They will be equipped accordingly.
• Swan Transformation. By means of a feather token they can transform into a large swan. It is believed that once they take a husband they must give this token to him.  Many are loathe to do that.