Overview
Sandcluster Tide Bastion is a broad, low Cryvum surface fortress grown from aragonite-inspired crystal-metal. Heavy forward siege emitters, dorsal shard-launch fields and a wide defensive belt sit above a continuous displacement hull, forming a coherent naval body that holds a protected region of sea.
Vessel Profile
Dimensions & Scale
Length 226.5 m × Width 55.5 m × Height 32.7 m. Height 32.7 m is the derived overall body height: 17.2 m above the design waterline plus 15.5 m draft. Supplied fictional length and beam; draft is the submerged depth of the hull.
Proposed operating mass: approximately 140,000 ton (metric tons). 226.5 m length × 55.5 m beam × 15.5 m draft × assumed submerged block coefficient 0.72 × assumed seawater density 1.025 ton/m³, rounded. Fictional loaded displacement estimate using draft, not above-water height.
Weapons & Armament
Two to four huge forward siege-emitter apertures concentrate frontal pressure. Two grouped dorsal shard-launch fields support layered attack, while eight to fourteen point-defense outlets cover the protected surface region. Short rooted projector spines, wedge-shaped firing recesses and split-prism launch cells are grown directly into the hull.
External Anatomy
Thick-root directional intergrowths form a heavy central fighting mass and wide lateral defensive shoulders. Two forward shoulder growths frame a lower wave-splitting keel ridge. Deep earth-brown roots support warm sand-colored faces and pale beige turning domains. A dark waterline belt separates upper fighting terraces from a smoother buoyant belly.
Functional Architecture
One or two low sensing ridges coordinate passive, optical and field observations with the layered batteries. Two to four recessed stern hydrolattice flow channels and smaller steering regions accelerate seawater. The continuous lower hull controls buoyancy and displacement; localized milky-amber activity marks purposeful outlets rather than a full-body energy aura.
Technical Specifications
Offensive rating: 85/100 — Heavy siege emitters and dorsal shard fields concentrate frontal surface pressure
Defensive rating: 90/100 — Thick lateral domains and layered point defense protect a measured region of sea
Mobility rating: 34/100 — Wide beam and deep draft favor station holding over fast confined maneuver
Tactical cognition rating: 76/100 — Low sensing ridges coordinate multiple defensive sectors and verified surface approaches
Endurance rating: 83/100 — Deep finite reserves sustain deliberate defense but limit simultaneous peak fire and movement
Fleet support rating: 73/100 — Wide defensive coverage shelters surface traffic and convoy assembly areas
Fleet Role
Sea-Surface Fortress Ship. Broad interception coverage and heavy forward pressure make the body suited to holding a surface approach or shielding a convoy assembly area. Deep reserves and thick shared roots support deliberate defensive service with fewer exposed structures.
Maritime Operations
The vessel floats by displacement at its design waterline. Recessed hydrolattice channels accelerate seawater for surface movement, while smaller field-biased regions provide steering. There are no exposed propellers, rocket exhausts or surface hover fields. Independent underwater diving or spaceflight is not assigned.
Defense Architecture
Heavy lateral crystal domains, a reinforced waterline belt and layered point defense shelter both the bastion and nearby surface traffic. Common-root load paths distribute impacts into the deep central body. Below-water damage can compromise displacement and reserve access, even when the upper terraces remain intact.
Operational Limits
A broad beam, deep draft and low maneuvering priority restrict confined or shallow approaches. Defensive fire, propulsion and siege pressure consume finite reserves. Damage below the waterline can force withdrawal. Mineral restoration requires time and a compatible supply; the bastion cannot maintain every sector at maximum output indefinitely.
Strategic Strengths
Broad interception coverage and heavy forward pressure make the body suited to holding a surface approach or shielding a convoy assembly area. Deep reserves and thick shared roots support deliberate defensive service with fewer exposed structures.
Capability Assessment
Proposed fictional doctrine profile. Broad interception coverage and heavy forward pressure make the body suited to holding a surface approach or shielding a convoy assembly area. Deep reserves and thick shared roots support deliberate defensive service with fewer exposed structures. Ratings describe intended roles rather than measured performance.
B · 73.5
Fleet-wide concept rating, 0–100; not simulated performance. Specialized strengths do not imply an equally high overall grade. Tactical Cognition describes sensing, coordination and command. Grade is the equal-weight mean: S ≥ 90, A ≥ 75, B ≥ 60, C ≥ 45, D < 45.
Technology Level
Proposed T0 — planetary crystal-metal naval fields, sensing and hydrolattice surface propulsion; independent spaceflight is not assigned
Weapon Class
Proposed W3 — fortress-scale siege emitters and layered surface interception
T0 planetary · T1 system flight · T2 phase travel · T3 limited world engineering. W0 point defense · W1 ship combat · W2 heavy fleet combat · W3 strategic theater systems. Technology and weapon classes are independent of the profile grade.
History & Lineage
Universe lore · authored service history
Origin
Grown in the sheltered Kelven Shoal cultivation reach to defend surface passages between mineral settlements. Its doctrine developed around protecting a moving boundary of sea rather than claiming every vessel within that boundary.
Lineage & Branch
Sandcluster surface-bastion branch, adapting fleet-fortress mass organization to aragonite-derived directional intergrowths, a buoyant lower hull and hydrolattice surface movement
Fleet or Unit
Cryvum — Kelven Shoal surface-defense formation; witness to the Pale Channel crossing and the Unclaimed Wake agreement
Individual History
Sandcluster Tide Bastion measures its first independent decision by the width of an unprotected wake. During cultivation at Kelven Shoal, formation witnesses taught it to hold a fixed boundary while smaller bodies moved through sheltered water. A nursery companion, Palegrain, repeatedly crossed outside the prescribed field during exercises. Sandcluster first drew the boundary tighter to keep the companion inside. Palegrain stopped answering the next movement request. Only after the bastion widened the protected approach without directing the companion's path did the exercise resume. Protection, it learned, could become a form of restraint.
Its first operational station guarded the Pale Channel, a deep surface passage serving several mineral settlements. The bastion's wide beam and heavy draft confined it to surveyed water, while lighter bodies checked the shoal edges. Sandcluster coordinated layered interception above a low wave-splitting bow and maintained enough reserve for repositioning. The assignment appeared orderly until an approaching convoy requested shelter for a damaged traveler whose growth material differed from the local nursery's accepted feed. Witnesses disputed whether the traveler should be admitted into the same protected region as their own unfinished bodies.
Sandcluster allowed a bounded passage under independent observation. It could shield the traveler from attack but could not promise that the settlement would supply compatible restoration material. Palegrain, now serving as a local survey body, guided the convoy along a route deep enough for the bastion to follow. An attack from beyond the outer shoal forced Sandcluster to redistribute defense toward the convoy. The newly exposed flank received a strike across the waterline root. It retained displacement, but the damaged boundary reduced its reserve circulation and made the return passage slower than planned.
At the settlement, the traveler asked to depart again rather than accept cultivation conditions that would alter its recognition rhythm. The formation wanted the bastion to hold it until the material hearing ended. Sandcluster refused to close the surface approach. It maintained limited protection while the traveler withdrew, then relinquished coverage at the surveyed boundary instead of claiming responsibility for water it could no longer observe. The event became the Unclaimed Wake agreement: assistance inside a protected zone would not make an independent body the property of the formation offering it.
The agreement did not resolve the damage allocation. Sandcluster requested compatible mineral to strengthen its waterline root, while a nearby nursery argued that several young bodies would lose their next growth interval if the fortress took its full allocation. A Pearlplane surface witness helped separate immediate displacement repairs from reinforcement that could safely wait. Sandcluster accepted staged work and served its next convoy with reduced forward siege pressure. The repair preserved its ability to move, but the less protected departure unsettled witnesses who had expected a fortress to make every crossing certain.
Palegrain now carries an account of the channel survey independent of the bastion's own record. The two disagree about when the outer shoal became unsafe, and neither has overwritten the other's timing. Sandcluster keeps the disputed interval near the healed waterline scar, where calmer sand-colored growth meets a darker common root. It continues to hold a measured surface region, opening its coverage to travelers whose choices it cannot control. Beyond that region, another faint return sometimes resembles the departing stranger. The bastion reports the contact without naming it a reunion and waits for a witness able to reach the water its own deep hull cannot cross.