Chrono Sentinel

medium construct (robot), unaligned

D&D 5.5 / SRD 5.2

Challenge 7.0 (2,900 XP)

Available with DM subscription
STR
16 (+3)
DEX
14 (+2)
CON
20 (+5)
INT
18 (+4)
WIS
12 (+1)
CHA
1 (-5)

Defense

Armor Class
17 (Natural Armor)
Hit Points
130 (13d8 + 65 +3)
Speed
30 ft.

Treasure & Loot Common

No significant treasure

Proficiencies & Senses

Saving Throws constitution, intelligence
Skills
Arcana +4, Nature +4, History +4, Insight +1, Stealth +2, Survival +1, Athletics +3, Acrobatics +2, Perception +1, Investigation +4
Senses
darkvision 60 ft.
passive Perception 11

Characteristics

Damage Vulnerabilities
—
Damage Resistances
force, poison
Damage Immunities
psychic
Condition Immunities
blinded, deafened, frightened, paralyzed, petrified, poisoned
Languages Common, Primordial

Traits and Actions

Time Warp

Trait
Once per day, the Chrono Sentinel can manipulate time around itself, gaining advantage on all rolls for 1 minute.

Temporal Shield

Trait
The Chrono Sentinel has a shield that absorbs damage from time-based attacks, granting resistance to force damage.

Temporal Slash

Action
Melee Attack: +9 to hit, reach 5 ft., one target. Hit: 20 (3d10 + 4) slashing damage that can ignore cover.

Time Displacement Pulse

Action
Ranged Attack: An energy burst that targets a 20 ft. radius within 60 ft. Each creature in that area must succeed on a DC 15 Dexterity saving throw or take 31 (7d8) force damage and be pushed 10 feet away from the center.

Rewind

Reaction
When hit by an attack, the Chrono Sentinel can use its reaction to roll a d6 and reduce the damage taken by an amount equal to the roll.

Running the encounter

Combat Behavior

Tactics

  • Utilizes Time Warp to gain advantage in combat.
  • Employs Temporal Slash for effective melee engagement.
  • Uses Time Displacement Pulse to damage and reposition multiple adversaries.

Combat Style

Reliable offensive capabilities and tactical retreats, focusing on behavior that instills confusion and dread.

Morale

Will fight to the last unless critically damaged, prefers to retreat to regroup.

Appearance & presence

Monster Description

The Chrono Sentinel is an advanced time-based construct created by an ancient civilization that mastered the manipulation of time. Designed for protecting sacred time portals, it possesses intricate gears and mechanisms that allow it to warp time and space. Its metallic frame is adorned with glowing runes and a core that pulses with energy that resonates with the fabric of time itself. Reddish metallic plating covers the intricate servos and electronics within its chassis, giving it an intimidating presence and a somewhat mystical appearance.

Legends say that those who can control a Chrono Sentinel may alter the course of their fate, but beware – time is a fickle master, and it punishes those who try to tread its waters carelessly.

Instincts & motives

Monster behavior

The Chrono Sentinel operates under strict commands given by its creators, focusing on protecting time anomalies at all costs. In battle, it uses its time manipulation abilities strategically, often distorting the perception of time for its enemies, allowing it to strike before they can react. The construct displays tactical intelligence, choosing to retreat when severely damaged to recover its resources and strategize for another encounter. It often employs hit-and-run tactics, appearing to teleport short distances, giving its foes a sense of uncertainty of time and location. Chrono Sentinels can also work in pairs to coordinate attacks, increasing their effectiveness in disrupting enemy tactics through their temporal abilities.

Habitat & life cycle

Ecology

Chrono Sentinels have no natural ecosystems as they are constructs, yet their influence certainly shapes the environments they patrol. They are often found near ancient artifacts or time-related phenomena, acting as guardians of places where the fabric of time is thin. They interact with the energy of their surroundings, absorbing temporal fluctuations to recharge. They exhibit little to no biological interactions; however, they do resonate with magical energies and can disrupt spellcasting in their vicinity, providing a unique challenge for adventurers that encounter them.

Origins & legends

History

Chrono Sentinels were created millennia ago by the Zaranthians, a technologically advanced civilization harnessing the power of time for protection against existential threats. These constructs were tasked with guarding time portals, which allowed their creators to traverse different epochs for knowledge and resources. However, as the Zaranthians grew reliant on technology, they ultimately met their demise in a catastrophic temporal explosion while experimenting with altering time flows. This upheaval sent shockwaves through the fabric of reality, leading to the disintegration of their civilization and leaving their constructs to wander the remnants of their once-great society.

Now, Chrono Sentinels are considered rare, sometimes encountered in ancient ruins, looking to fulfill their duty long after their creators have vanished. Adventurers often find themselves at odds with these constructs as they reveal their secrets or attempt to harness the power of time for themselves. Because of their long existence, each Chrono Sentinel may have a different level of programming malfunction, leading to unpredictable behavior and a chance that an encounter could either end in conflict or become a partnership in understanding time.

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