Dark Psion
First Post
http://www.wizards.com/default.asp?x=dnd/tt/20061003a
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Notice the line;
If your Pseudodragon has butterfly wings, I'm afraid you have actually caught a Faerie Dragon, but if you are breathing the air around it, you probably don't have a care in the world at this point.

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Notice the line;
Pseudodragon Lore
The mischievous (some would say annoying) tiny dragons have become a staple of D&D since their inclusion in the 1980s. Attractive, intelligent, and capricious, pseudodragons are a creature on which adventurers may want to do their homework before allowing in their group.
Knowledge (Arcana)
Characters with ranks in Knowledge (arcana) can learn more pseudodragons. When a character makes a successful skill check, the following lore is revealed, including the information from lower DCs.
DC Result
15 This tiny reptilian creature with butterfly-like wings is a pseudodragon. This result reveals all dragon traits.
If your Pseudodragon has butterfly wings, I'm afraid you have actually caught a Faerie Dragon, but if you are breathing the air around it, you probably don't have a care in the world at this point.

