Mirror Arrow

Mirror Arrow is a bow attack skill that fires an arrow, dealing damage and summoning a clone when it reaches its destination. The clone is a minion that uses the player’s bow and quiver. It requires Level 10. Tag: Attack, Minion, Duration, Movement, Travel, Bow.

Mirror Arrow Recipe

Outcome	Vendor Recipes
1x Mirror Arrow	1x Blink Arrow 1x Orb of Alteration

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So to confirm, cluster traps and multi traps reduce the damage done when it is tied to the gem even by something such as linking mirror/blink arrow to trap and cluster trap the damage reduction applies to minions and so they do less damage when using either cluster or multi? but also the reverse side doesn't apply the same way in that the trap damage when tied to a bow minion does not increase the damage?

Yes.

- ie: only way to really scale mirror/blink arrow is to scale minion damage and trap reductions apply but trap increases do not apply to bow minions

No. Trap damage modifiers do not apply to minions summoned by traps. Cluster Trap and Multitrap give "less damage", not "less trap damage" - the reason it applies is because it is not a modifier to "trap damage"