Void Reaver

The Void Reaver is a new robotic-crustacean Monster added in the Hidden Realms Update, who can appear on Rallypoint Delta and Siren's Call after the first Loop.

Void Reaver corpses can be observed around the Null portal, impaled by spikes of what appears to be purple glass.

Nullifier Artillery
The Void Reaver attacks by means of artillery. This attack applies a stacking debuff on hit. When this stacks 3 times, the victim is kept in place.

This skill has no Proc Coefficient.

Nullifier Implosion
Upon death, a delayed implosion will instantly kill anything caught in it, even the Void Reaver's allies. Despite the instant kill, the implosion does not do damage.

If the player has a Dio's Best Friend, they will still be revived regardless.

Dying to this explosion yields a unique death message: "You have been detained, await your sentence at the end of time." If someone else in your multiplayer game gets killed by the explosion the death message for everyone else is " has vanished without a trace."

Trivia

 * The Void Reaver is the only Monster that doesn't appear (within the regular Environments) prior to Looping.