Lunar Portal Staff

The Lunar Portal Staff is a Hardmode, post-Moon Lord minion-summoning item that summons a floating "portal". The player cannot interact with it; it instead fires a continuous beam at enemies within its 60-tile range. The Lunar Portal Staff is a sentry-style minion, similar to the Frost Hydra, only lasting one minute, remaining stationary, and not counting against the player's minion capacity. The Lunar Portal Staff has a 1/9 chance (11.11%) of being dropped by the Moon Lord boss.

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 Lunar Portal Staff has over a Ruthless one is knockback.

Tips

 * The portal fires a beam that will sweep across enemies in a wide arc, so make sure to position so that it can sweep the beam across a good section of the ground to hit the maximum number of enemies.this allows it to do large dps to monsters and bosses made up of segments like The Destroyer. Generally this means making sure to place it fairly high over head although of course it varies based on terrain.
 * The Queen spider staff, Lunar portal staff, Rainbow crystal staff and Frost hydra staff can all be used at the same time.

History
Baguette de Portail Lunaire