A Potamoi river god gives instructions on how to collect this stuff to a girl who almost drowned herself in him. To avoid the poisonous creatures central to her second task given by Aphrodite, Psyche collects this stuff from thorn bushes at (-5[1])night. One figure gives this stuff to a king as a gift of gratitude for being saved from a sacrifice plot devised by his (-5[1])step-mother Ino; that figure is (15[1])Phrixus. This stuff was (*) hung on an oak tree in a grove sacred to (10[1])Ares, where it was guarded by a dragon (10[1])whose teeth could become (10[1])soldiers. King Iolcus gives a man who arrived at his court with only one (10[1])sandal a challenge involving this stuff. Orpheus, Heracles, and several other Greek heroes later join that challenge to obtain this stuff. For 10 points, name this material Jason fetched with the (10[1])Argonauts. ■END■