The Ancient Sentinel is a reoccurring mega-boss encounter introduced in the 2.85 Patch for players who have defeated the Ancient Construct and are level 50 or more. It appears in the Ancient Ruins, after a brief dialogue between the characters.
The Ancient Sentinel is comprised of three different parts:
- Main Body
- Melee Weapon System, the rake arm on its left
- Ranged Weapon System, the laser arm on its right
Each part has its own pool of health and armor, as well as unique set of attacks. Each part has an incredible amount of damage reduction against all damage types, and coupled with a devastating array of indirect line-of-fire attacks that can target multiple spaces of the battlefield; the Ancient Sentinel is truly a challenge for even the most experienced armies. The Ancient Sentinel has 2400 and both the ranged and the melee arms have 1100. Altogether, the Ancient Sentinel has a whopping total of 4600 with . That is twice as much health that the ancient Construct has which is 2100 with .
In addition to the usual victory spoils, defeating the Ancient Sentinel yields a small chance to obtain either a melee or ranged fragment - units that can be fielded and promoted by the player. The Melee Fragment boasts a combined HP and armor of 825 HP at rank 1. The Ranged Fragment has a combined HP and armor of 600 HP at rank 1.
All three parts of the Ancient Sentinel have an unbelievable amount of damage reduction, so that a Rank 5 Tank Killer will only do about 150 damage, assuming all shots hit. The Melee Weapon System can be stunned while the Ranged Weapon System can be frozen. Freeze and stun suspectability changes between the two arms; you need to test it first before launching a full attack.
Fielding Soldiers could be a disadvantage since the Main Body and the Ranged Arm have attacks that have high armor piercing AND critical bonuses against infantry. The Melee arm has critical bonuses against Vehicles, and is ineffective against infantry. Tanks tend to have more health and armor as well as better damage reduction to survive the Sentinel's onslaught. One working strategy is to use 2 Rank 6 Veterans, 2 Rank 6 Raider Recruits, or 2 Eagle Eyes (Equal defense and dodge but way less health) in the front line. The high dodge and defense of these units allow it to survive the attacks of the Sentinel as long as the Ranged Arm is out of action. This strategy also helps when there are no vehicles in the front row. It makes the melee arm unable to use the checker attack, making it nearly useless.
The Ranged arm can be frozen, which takes it out of action for a few turns as well as making it more susceptible to every damage type. Note that replaces its damage reduction with 125% susceptibility. Fielding a unit capable of paired with a high-rank Tank Killer can dispatch the Ranged Weapon System quickly. However, Tank Killers are not recommended for fighting the Ancient Sentinel as they die quickly.
The Melee arm can be stunned, and given that it has the lowest cooldowns on its attacks, stunning this arm can buy the player a turn to do some damage to the Sentinel or heal a critical unit. Also, the Melee Arm's most devastating attack can only hit vehicles on the front line. If there is only infantry on the front line then the attack is negated.The main portion of the Sentinel can be affected by the damage-over-time effects, and . However, DoT damage is calculated based on the initial damage done, which is pitifully low given the Sentinel's incredible damage reduction. DoT effects should not be relied upon, but only treated as a bonus when coupled with high-damaging attacks.