Boulder Probe Staff

The Boulder Probe Staff is a sentry summon weapon that is dropped by the Granite Energy Storm. It spawns a stationary Granite Boulder Probe that zaps enemies with an instantaneous beam that pierces infinitely and inflicts the Granite Surge debuff, dealing additional damage and lowering defense. However, it is unique from most minions, as it does not automatically target enemies; rather, it shoots in the direction of the summoner's cursor. It will fire once every 1.25 seconds for 2 minutes before disappearing, but can also be desummoned manually by right-clicking the staff. Summoned boulder probes are invincible.

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 Boulder Probe Staff has over a Ruthless one is knockback.