Ancient Sentry

Overview
The Ancient Sentry is a promotional unit released during the 6th Invasion Competition, available July 11-15, 2014 for. It was re-released for one day on June 23rd 2015 for as part of the Breaking Into the Vault! sale.

The Sentry Shielding attack hits each of the three squares in front of the sentry and does splash damage beyond that. The total damage can be significant. The laser attacks can be very powerful in PvP.

Since the Sentry is a Defense unit, it can occupy defense-only unit slots in the player's formation. It is the first defensive unit that is not ignorable, meaning that the battle will not end if one side has only a Sentry left on the field.

Up to four Ancient Sentries can be used in the same battle.

Attacks
Concealed Lasers=

Sentry Shielding=

Trivia

 * It was the "Jackpot" prize for the 14th Secret Vault and the "Rare" prize in the 15th Secret Vault.
 * It appears to be the head of the Ancient Sentinel.
 * Despite the name, Sentry Shielding is an offensive attack.