Think about DATA as defining a read-only file that's build into your program. Use the READ command to read the data. Use RESTORE to point to the beginning of the data that you want to read.
@MONSTER_1
DATA "zombie", 45
@MONSTER_2
DATA "skeleton", 64
DIM A$,B ' name & move speed
RESTORE @MONSTER_2
READ A$,B
1そうだね プレイ済み