The Lunar Portal Staff is a Hardmode, post-Moon Lord summon weapon 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 two minutes, 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.