GLOBAL OPERATOR: ZERO SUM

Combat & turn quick reference · GDD v0.21

Turn structure

Phase	Rule
Initiative	d20 + DEX mod, high to low. Ties: higher DEX wins.
On your turn	1 move (tactical reposition) + 1 action (shoot, reload, med, breach, interact).
Reload	1 action. Drop mag or tactical reload (GM call).
Round	~6 seconds. Bleeds tick end of affected operator's turn.

Movement

Mode	Rule
Move	5 m per turn. Free — take it before or after your action.
Sprint	Spend your action to move again (10 m total). Shots at a sprinter: +2 DC.
Stealth move	Half speed. DEX vs watcher's WIS to stay unseen.
Drag downed ally	Half speed. Both hands — no weapon.
Go prone / stand	Part of your move.
Between POIs	Narrative travel — no turns. GM may call WIS (spot) or DEX (stealth) on approach.

Blacked leg = −10% move each. Range bands (close ≤5 m / mid ~25 m / long ~100 m) match the to-hit DCs.

Actions (1 per turn)

Action	Notes
Shoot	One attack (burst if weapon allows: 3 shots, −2 to hit each)
Reload	Drop mag or tactical (GM call)
Med	Bandage / tourniquet self or adjacent ally
Stabilize	WIS DC 12 on a downed operator — stops death saves
Interact / loot	Open, search, or strip one item from a body
Breach	STR check or breach charge (auto)
Throw	Grenade / smoke — 10 + STR×5 m, DEX DC 12 or scatter 1d6 m
Sprint	Second move (see Movement)

Checks & proficiency

Rule	Detail
Checks	d20 + stat mod vs DC — Easy 10 · Standard 12 · Hard 15 · Extreme 18. No skill list: the six stats are the skills (DEX stealth, WIS spot/med, INT craft, CHA barter, STR breach, CON resist).
Weapon proficiency	At creation pick a specialty family +3 and a secondary +2. Everything else +0. Families: Pistols · Carbines/Rifles · Shotguns · DMRs · Heavy.
Recoil Control (RC)	Offsets shooting penalties from burst fire and sprinting-target shots, up to 0 (never a bonus). Burst −2 with +1 RC = −1. Sources: Foregrip +1, Range station +1/+2.

Doors & breaching

Door	Force (loud)	Pick (quiet)
Interior / flimsy	STR DC 10	— (or just open)
Locked commercial	STR DC 12	DEX DC 12
Security / reinforced	STR DC 15	DEX DC 15
Vault / cage	No roll	Breach charge or key only

Force and breach charges are loud — first one per encounter ticks the exfil clock. Picking is quiet, 1 action. Failed force = noise anyway, door holds. Breach charge: auto-opens anything, 1 action to set.

10-second combat loop

Hit — d20 + DEX + prof + situational vs DC (12 close / 15 mid / 18 long / 22 extreme+cover). Nat 1 = jam.
Location — d12: 1–2 head · 3–5 thorax · 6–7 stomach · 8–12 limbs (no armor).
PEN vs CLASS — PEN ≥ CLASS = PENETRATE. PEN < CLASS = STOPPED.
Resolve — see table below. Head ×3 if no helmet (after pen/stop).

Penetration & damage

Result	Flesh	Armor	Bleed
Penetrate	Full DMG	−1 DUR	Light bleed (Heavy on head/thorax pen)
Stopped	BLUNT (on card)	−A-DMG DUR (LOW−1 / MED−2 / HIGH−4)	Spall check (below)

Spall, in plain words: the plate stopped the bullet, but fragments can still spray into the target. Only happens on STOPPED hits — never on penetrations.

Roll d100.
Roll ≤ the ammo's FRAG%? Target takes a Light bleed (Heavy if the hit was head/thorax). Roll over: nothing extra.
That's it — spall is a bleed, not damage. It stacks on top of the BLUNT the target already took.

Example: AKM round (FRAG 24%) stopped by a Class 4 vest on the thorax. Target takes 15 BLUNT. Roll d100 = 19 → 19 ≤ 24, so the target is also Heavy bleeding. Nat 20 on the original to-hit? Spall check rolls at FRAG × 2.

Hit zones (max HP)

Zone	HP	At 0
Head	20	KIA
Thorax	50	KIA · Crit if <15
Stomach	40	Critically injured
Arm / Leg	30 / 35	Blacked

Bleeds & meds

Bleed	Effect	Stop
Light	−1 HP/turn to zone	Bandage (1 action)
Heavy	−3 HP/turn · 2 turns untreated = incap	Tourniquet (1 action)

Max 1 Light + 1 Heavy per operator.

Cover & situational

Condition	Effect
Braced / prone	+2 or Advantage
Flank 90°+	Ignore 1 AC or Advantage
Suppressed target	Disadvantage return fire
Point blank <2m	Auto thorax · 20% head

Playtest arms (M9 · M4 · AKM)

Weapon	Cal	PEN	DMG	BLUNT	FRAG
M9	9×19	1	28	9	13%
M4	5.56	3	38	13	25%
AKM	7.62×39	3	44	15	24%

Contractor / NPC arms

Weapon	Cal	PEN	DMG	BLUNT	Notes
M590	12 gauge	2	50	17	≤5 m only
Mk11	7.62×51	4	54	18	DMR · +2 long prone
NSV	12.7×108	5	76	25	Turret · burst 3

Common ammo (by caliber)

Ammo	PEN	DMG	BLUNT	FRAG
9×19 Ball (M9)	1	28	9	13%
5.56 Ball (M4)	3	38	13	25%
7.62×39 Ball (AKM)	3	44	15	24%
7.62×51 Ball (Mk11)	4	54	18	27%
12 gauge Buck (M590)	2	50	17	20%

Armor classes

Class	DUR	Stops PEN
1	20	≤0
2	25	1
3	35	≤2
4	45	≤3
5	60	≤4
6	80	≤5

DUR 0 → Class −1, reset DUR to half new max.

Death states

State	Trigger
Injured	1 limb blacked
OOA	Stomach 0 · 2+ limbs blacked · Thorax <15
KIA	Head/thorax 0 · 3 failed death saves

Exfil rule: Don't exfil the Zero → don't keep. Keep Case only (3 slots at start · Vault upgrades to 6).