work in progress: the krill siren tech, building & ship part

default/scripting/buildings/KRILL_SIREN.focs.txt

@@ -0,0 +1,38 @@
+BuildingType
+    name = "BLD_KRILL_SIREN"
+    description = "BLD_KRILL_SIREN_DESC"
+    buildcost = 250 * [[BUILDING_COST_MULTIPLIER]]
+    buildtime = 10
+    location = And [
+        Planet
+        Not Contains Building name = "BLD_KRILL_SIREN"
+        OwnedBy empire = Source.Owner
+    ]
+    enqueuelocation = [[ENQUEUE_BUILD_ONE_PER_PLANET]]
+    effectsgroups = [
+        [[SPECIES_LIKES_OR_DISLIKES_BUILDING_STABILITY_EFFECTS]]
+
+        EffectsGroup
+            scope = WithinDistance distance = 0.00001 condition = Source
+            stackinggroup = "KRILL_SIREN_STEALTH_STACK"
+            effects = SetStealth value = Value - 10
+
+        // TODO: maybe just slow down krill who are moving away and speed up those moving towards
+        /*
+        EffectsGroup
+            scope = And [
+                Ship
+                OwnedBy empire = Source.Owner
+                WithinDistance distance = 50 condition = Source
+                Speed low = 1 // Immobile objects do not get the starlane speed boost.
+            ]
+            stackinggroup = "LIGHTHOUSE_SPEED_STACK"
+            effects = SetSpeed value = Value + 20
+        */
+    ]
+    icon = "icons/building/krill-siren.png"
+
+#include "/scripting/common/enqueue.macros"
+#include "/scripting/common/base_prod.macros"
+#include "/scripting/buildings/buildings.macros"
+#include "/scripting/common/priorities.macros"

default/scripting/ship_parts/General/SP_KRILL_SIREN.focs.txt

@@ -0,0 +1,16 @@
+Part
+    name = "SP_KRILL_SIREN"
+    description = "SP_KRILL_SIREN_DESC"
+    class = General
+    mountableSlotTypes = Core
+    buildcost = 100 * [[FLEET_UPKEEP_MULTIPLICATOR]] * [[SHIP_PART_COST_MULTIPLIER]]
+    buildtime = 10
+    tags = [ "PEDIA_PC_GENERAL" ]
+    location = All
+    effectsgroups = [
+        // TODO: see also: MONSTER_FLEET_MOVE_STACK
+    ]
+
+    icon = ""
+
+#include "/scripting/common/upkeep.macros"

default/scripting/techs/ship_weapons/SHP_KRILL_SIREN.focs.txt

@@ -0,0 +1,20 @@
+Tech
+    name = "SHP_KRILL_SIREN"
+    description = "SHP_KRILL_SIREN_DESC"
+    short_description = "SHIP_PART_UNLOCK_SHORT_DESC"
+    category = "SHIP_WEAPONS_CATEGORY"
+    researchcost = 150 * [[TECH_COST_MULTIPLIER]]
+    researchturns = 10
+    Unresearchable
+    tags = [ "PEDIA_SHIP_WEAPONS_CATEGORY" ]
+    prerequisites = [
+        "GRO_MEGA_ECO"
+        "CON_CONTGRAV_ARCH"
+    ]
+    unlock = [
+        Item type = ShipPart name = "SP_KRILL_SIREN"
+        Item type = Building name = "BLD_KRILL_SIREN"
+    ]
+    graphic = "icons/monsters/krill-3.png"
+
+#include "/scripting/common/base_prod.macros"

default/stringtables/en.txt

@@ -13177,6 +13177,12 @@ Solar Containment
 SHP_SOLAR_CONT_DESC
 A hull constructed from pure energy, while far more versatile than a solid hull, has a disadvantage in that it is unable to harness the potential energy of material objects. If, however, it were made possible to contain a hull composed not of pure energy, but of super-heated gases constantly undergoing a self-sustaining fusion reaction, the limitations of both pure energy and solid matter could be avoided.
 
+SHP_KRILL_SIREN
+Krill Siren
+
+SHP_KRILL_SIREN_DESC
+Unlocks the [[shippart SP_KRILL_SIREN]] ship part and the [[buildingtype BLD_KRILL_SIREN]] building, which both draw wild space krill from nearby star systems towards their position on the map.
+
 SHP_KRILL_SPAWN
 Krill Spawner
 
@@ -14483,6 +14489,12 @@ BLD_BIOTERROR_PROJECTOR_DESC
 
 This clandestine biological warfare base wreaks havoc on enemy planets in the vicinity. Such activities are not endorsed by the public however, and this facility can only be built on a planet with a resonant moon. Ineffective if there is a [[buildingtype BLD_GENOME_BANK]] building in the enemy empire. [[BUILDING_AVAILABLE_ON_OUTPOSTS]], provided it has a [[special RESONANT_MOON_SPECIAL]].'''
 
+BLD_KRILL_SIREN
+Krill Siren
+
+BLD_KRILL_SIREN_DESC
+Decreases the [[metertype METER_STEALTH]] of all objects in the same system by 10. [[BUILDING_AVAILABLE_ON_OUTPOSTS]] and will attract wild space krill from nearby star systems towards its position on the map.
+
 BLD_LIGHTHOUSE
 Interstellar Lighthouse
 
@@ -15811,6 +15823,12 @@ Nova Bomb
 SP_NOVA_BOMB_DESC
 A weapon of tremendous power capable of destroying an entire system. The weapon will activate when it receives the signal from a [[buildingtype BLD_NOVA_BOMB_ACTIVATOR]] not more than one starlane jump away.
 
+SP_KRILL_SIREN
+Krill Siren
+
+SP_KRILL_SIREN_DESC
+Attracts wild space krill from nearby star systems towards its position on the map. Also reduces stealth for ships in the same system or travelling in the same fleet by 10.
+
 SP_KRILL_SPAWNER
 Krill Spawner