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Its best modifier is Legendary.

Its best modifier is Godly or Demonic. Both modifiers increase its average damage output by the same amount.

Its best modifier is Godly or Demonic for maximum damage-per-hit, or Deadly for increased speed.

Its best modifier is Light for harvesting purposes and Legendary for combat purposes.

Its best modifier is Legendary. While Light may seem to provide a better speed boost by percentages, rounding reveals that Legendary and Light mine at equal speeds for this tool.

Its best modifier is Unreal.

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Its best modifier is Demonic or Deadly, as it does not have any knockback and thus cannot get modifiers that affect it.

Its best modifier is Mythical.

Its best modifier is Ruthless. The Mythical modifier provides the widest array of stat bonuses, but the only stats that improve damage output are damage and critical chance. Switching to a different magic weapon causes existing projectiles to use that weapon's critical chance instead, meaning that the item's is optimized with the Ruthless modifier when used in the intended way.

Its best modifier is Demonic or Deadly for damage output, or Mystic for mana conservation because it cannot get modifiers that affect knockback.

Its best modifier is either Masterful for mana conservation or Godly/Demonic for higher damage output. It cannot get the Mythical modifier due to its low mana cost.

Its best modifier is Ruthless. The Mythical modifier provides the widest array of stat bonuses, but these primarily affect the initial summon rather than the resulting minion. Additionally, minions cannot deal critical hits. The only lasting advantage a Mythical item has over a Ruthless one is knockback.

Its best modifier is either Agile or Massive to its unusually low base damage and consequent inability to obtain high damage boosts from modifiers.