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From Terraria Wiki
Biggest Twins army possible (11 Twins = 22 minions)
The Optic Staff is a Hardmode summon weapon that summons a miniature version of The Twins in their second form, which follow the player and attack enemies. The summoned pair of characters (named Spazmamini and Retinamini, respectively) attack via a melee and ranged laser attack respectively, similar to the behavior of The Twins boss (except for the cursed flames that Spazmamini doesn't spew). Like other minions, the summoned Twins are invincible and follow the player for an unlimited amount of time, unless the player dies, exits the world, summons a replacement minion, or cancels the buff.
Its best Modifier is Ruthless. The Mythical modifier provides the widest array of stats bonuses, but these primarily affect the initial summon rather than the resulting minion. Additionally, Minions cannot deal critical hits. The only significant advantage a Mythical Optic Staff has over a Ruthless one is knockback.
- One pair of twins counts as one minion toward the maximum minion count.
- Since the twins are paired, a player can get 22 "minions" with maximum minion capacity, as opposed to the usual 11.
- Its laser projectiles emit a small amount of light.
- The lasers travel straight forward, so they may miss against fast or far away enemies.
- Due to its piercing attacks, the twins can only hit the same enemy a maximum of 6 times per second, regardless of how many twins are summoned (this applies to all weapons and summons that pierce enemies).
- It is possible to get unmatching amounts of Retinamini and Spazmamini by maxing the spawn cap and lowering it. (it's still impossible to get an odd amount of them.)
- Unlike most flying minions, the Twins will not naturally pass through blocks unless the player has moved out of range. This makes them incredibly prone to getting stuck in tight areas and caves.
- The Optic Staff is effective against bosses, as each eye attacks individually, and is especially effective against The Destroyer, as the Spazmamini will pierce each segment.
- They do not do well against a separated mob crowd, and are better for thick mob crowds such as those in the Pumpkin Moon, Frost Moon, and Goblin army, as well as in the Dungeon.
- The icon indicating that game data is saving on the Mobile version and version resembles the Optic Staff minions, except it looks more like the first stage of a Retinamini, instead of the second, mechanized stage.
- Console 1.08: Added Optic Staff, and several other minions.
- 22.214.171.124: Now requires 10 mana. Fixed bug where Twin Minion pairs could go uneven / re-summoning would fail.
- 1.2.4: Introduced.