A stirge attacks by landing on a victim, finding a vulnerable
spot, and plunging its proboscis into the flesh. This is a touch
attack and can target only Small or larger creatures.
Attach (Ex): If a stirge hits with a touch attack, it uses its
eight pincers to latch onto the opponent's body. An attached
stirge has an AC of 12.
Blood Drain (Ex): A stirge drains blood, dealing 1d4 points of
temporary Constitution damage each round it remains attached.
Once it has drained 4 points of Constitution, it detaches and
flies off to digest the meal.