You are prepared to do the skill.
As you complete the skill, you _leap_ backwards.
You fire an arrow at Mirror monster.
You found a soft spot in Mirror monster's hide!
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You feel you have found all there is to know about the weak points of
'elemental' monsters.
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Still 3 categories to master.
The arrow scrapes a jagged wound in Mirror monster's scalp!
You see from the wound your shot did full magical damage.