Use Artemis's Arrow to double the aging speed of your mare while she is gestating. This means, in this case, that one aging point ages the mare by 4 months instead of the usual 2. This object may be put on the mare at any time, but it only works during the gestation period. Artemis's Arrow can also be used on mares that have Water from the Well of Youth, in which case the mares age 2 months instead of 1.