ADVENT Sentry (LWOTC)

The ADVENT Sentry is the first enemy type XCOM will consistently encounter that is unique to the Long War. While its direct shots are only moderately stronger than those of the standard Trooper, the Sentry sets itself apart via its enhanced detection radius and specialization in Overwatch. With its base ability Ready For Anything, the Sentry is able to shoot and enter Overwatch in the same turn, granting it remarkable action economy and volume of fire.

Like other ADVENT troop types, the basic Sentry will slowly be phased out in favor of stronger variants as the campaign progresses. The Guardian gains the ability to fire more and deadlier Overwatch shots, and to do so upon any XCOM action. The stronger-still Sentinel can be surprisingly tough to take down, while also gaining an additional option to take on its own turn in the form of a fragmentation grenade.

ADVENT Sentry (Rank 1)

Difficulty	Health	Aim	Crit Chance	Flanking Crit Chance Bonus	Mobility	Will	Hack Defense	Detection Radius (tiles)
Rookie	3	65	0	33	12	40	125	9
Veteran	4	65	0	33	12	45	125	9
Commander	4	70	10	40	12	45	125	9
Legend	5	70	10	40	12	45	125	9

Weapon	Damage	Crit Damage	Clip Size	Other
ADVENT Mag Rifle	2 - 5	1	3	-

Max Units in Pod = 4
Force Level	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20
Leader Spawn Weight	1	1	1	1	1	0	0	0	0	0	0	0	0	0	0	0	0	0	0	0
Follower Spawn Weight	2	3	3	5	5	6	5	4	2	1	1	1	0	0	0	0	0	0	0	0

Abilities and Tactical Upgrades
Ready For Anything Enter overwatch after firing a turn ending standard shot with your primary weapon.	Center Mass You do one additional point of base damage when using guns. 16% chance of applying after completion	Combat Awareness Grants 15 defense and an armor point when in overwatch. 50% chance of applying after completion

Advanced Sentry (Rank 2)

Difficulty	Health	Aim	Crit Chance	Flanking Crit Chance Bonus	Defense	Mobility	Will	Hack Defense	Detection Radius (tiles)
Rookie	5	70	0	33	5	12	60	125	11
Veteran	6	70	10	33	10	12	65	125	11
Commander	7	75	10	40	10	12	65	125	11
Legend	8	75	10	40	10	12	65	125	11

Weapon	Damage	Crit Damage	Clip Size	Other
ADVENT Mag Rifle	4 - 7	2	3	-

Max Units in Pod = 4
Force Level	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20
Leader Spawn Weight	0	0	0	0	0	1	1	1	1	1	1	0	0	0	0	0	0	0	0	0
Follower Spawn Weight	0	0	0	0	0	0	1	2	5	5	5	5	5	5	5	5	5	4	2	2

Abilities and Tactical Upgrades
Ready For Anything Enter overwatch after firing a turn ending standard shot with your primary weapon.	Cool Under Pressure You gain +10 Aim on Overwatch and other reaction shots, and they can critically hit.	Guardian After a successful overwatch shot, there is a 50% chance to gain a bonus overwatch shot.
Covering Fire Overwatch now trigger on any hostile action, not just movement. Overwatch shots now ignore 2/3 of cover bonuses.	Center Mass You do one additional point of base damage when using guns. 16% chance of applying after completion	Combat Awareness Grants 15 defense and an armor point when in overwatch. 50% chance of applying after completion

Elite Sentry (Rank 3)

Difficulty	Health	Armor	Aim	Crit Chance	Flanking Crit Chance Bonus	Defense	Mobility	Will	Hack Defense	Detection Radius (tiles)
Rookie	9	0	70	10	33	10	12	80	175	12
Veteran	12	0	70	10	33	10	12	85	175	12
Commander	13	1	75	10	40	10	12	85	175	12
Legend	15	1	80	10	40	10	12	85	175	12

Weapon	Damage	Crit Damage	Clip Size	Other
ADVENT Mag Rifle	5 - 10	3	3	-
ADVENT Grenade	2-7	-	1	Range: 10 Radius: 4 Shred: 1 Env Dmg: 9

Max Units in Pod = 4
Force Level	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19	20
Leader Spawn Weight	0	0	0	0	0	0	0	0	0	0	0	1	1	1	1	1	1	1	1	1
Follower Spawn Weight	0	0	0	0	0	0	0	0	0	0	0	0	2	4	4	4	6	6	6	6

Abilities and Tactical Upgrades
Ready For Anything Enter overwatch after firing a turn ending standard shot with your primary weapon.	Cool Under Pressure You gain +10 Aim on Overwatch and other reaction shots, and they can critically hit.	Sentinel When in overwatch, you may take two reaction shots.
Tactical Sense Gain 3 defense for each enemy you can see, up to a maximum of 15 defense.	Covering Fire Overwatch now trigger on any hostile action, not just movement. Overwatch shots now ignore 2/3 of cover bonuses.	Center Mass You do one additional point of base damage when using guns. 16% chance of applying after completion	Combat Awareness Grants 15 defense and an armor point when in overwatch. 50% chance of applying after completion

Tips

Like most flankable units, they will ideally try to find reasonable cover whenever flanked. This can be taken advantage of if you want to force enemies to move.
Sentries boast a higher detection radius than most trooper variants, so be wary of potential hiding spots such as dark corners to avoid being surprised.
The Sentry's main threat is its action economy through Ready for Anything. Methods to neutralize this include flashbangs, Lightning Reflexes, or simple damage (though be mindful of Covering Fire against Guardians and Sentinels).