Well, I'm currently trying to work on a Greek-myth-based setting and decided to make nymph a subtype instead of a monster.
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Spoiler:
1/day—a nymph can create a 20-foot-radius burst that causes humanoids within the aura's range to become fascinated with the user (as the bard's fascinate bardic performance). Affected humanoids may resist this effect by making a successful Will saving throw (DC 10 + 1/2 the user's character level + the user's Charisma modifier).
Spoiler:
Nymphs add +1 to their caster level when casting charm person and charm monster.
Spoiler:
Nymphs gain a +2 dodge bonus to AC when in a specific terrain type selected from the ranger's list of favored terrains. This choice is made at character creation, and cannot be changed.
Since bogeymen play such a pivotal role in my next campaign I had to make the CR 10 one a basis for all bogeymen (deepest fear, striking fear and terrible rejuvenation, fey with cold iron DR, sneak attack and spell resistance). It also allows me to create variant bogeymen like ravermen, sorrowers, white lady's and so forth.
Also, dot
In case I see an idea worth stealing :)