SET
/* Edit these values */
@Health = 10,
@Mana = 10,
@minlevel = 255,
@maxlevel = 255,
@MapID = 548;

/* Do not edit anything under this text unless you know what you are doing */
UPDATE creature_template AS t
INNER JOIN creature AS c
ON t.entry = c.id
SET
t.Health_mod = t.health_mod / @Health, t.minlevel = @minlevel, t.maxlevel = @maxlevel, t.Mana_mod = t.Mana_mod / @Mana
WHERE
c.map = @MapID;