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 Phrixus. This stuff was (*) hung on an oak tree in a grove sacred to Ares, where it was guarded by a (-5[1])dragon whose teeth could become soldiers. King Iolcus gives a man who arrived at his court with only one sandal a challenge involving this (10[1])stuff. Orpheus, Heracles, and several other Greek heroes later join that challenge to obtain this stuff. For 10 points, name this material Jason (10[1])fetched with the Argonauts. (10[2])■END■