I know im asking too much questions but its an nice adventure game right ? So
Sometimes enemies are attacking first at combat. Is it randomize or have a way to attack first ?
Check info posts like this one. This way you'll find an answer faster.
Speed affects action order during combat. Characters with higher speed act first. Some skills can affect your speed both positively and negatively. For example, healing skills and drinking potions have top priority to avoid scenarios where players decide to heal but get finished off by a faster enemy.