Star Sentry

The Star Sentry is a mob that spawns with a random event in the Dwarven Mines at any time. (This is not part of the regular cycle of events, it is a random occurrence).

When the event occurs, the following message will be displayed in chat letting players know the location of they will spawn at:

Like Spooky Mobs, the Star Sentry takes 1 health per hit regardless of the accessories, weapons, or armor used. Unlike Spooky Mobs however, they do not take damage from a weapon's Thunderlord Enchantments, absolutely requiring the Star Sentry to be hit 10 times. However, the applying the Stellar reforge to a pickaxe will allow it to deal an additional damage to the Star Sentries, reducing the needed hits to defeat a one from ten to five, as well as increasing the likelihood of Starfall being obtained.

Note: Dwarven Mines is not the only place the Fallen Star Event spawns at, it also appears in; the Royal Mines, Far Reserve, and the Cliffside Veins. Not all known spawn locations are known, and this list will update as people gather information.