Mutations
Mutations are itemized character modifications similar to WE stats and implants. Unlike WE stats but similarly to implants, they can be traded between players initially, and only become account-bound once installed.
Every character starts with four mutation slots; additional ones can be unlocked by installing FEV-1, which itself doesn't take up a slot.
Each mutation has a bonus and a penalty. Your current stats (including temporary increases from drugs, etc.) must be high enough to allow the mutations you have installed to fully apply their combined penalties. If a mutation's penalty would push a stat below its minimum allowed value (0 for most stats; 1 for hit points, SPECIAL, and action points), the mutation is disabled. Note that some stats have a negative effect associated with going sub-zero and are thus able to accommodate higher penalties than it might appear at first glance. For example, FEV-ALM, which grants +10% critical chance at the cost of -5% damage protection, can be activated even if you have no damage protection, resulting in your taking 5% more damage from incoming hits.
You can install as many instances of a single mutation as your stats allow, but be aware that mutations' negative effects are tripled with each repeated installation. For example, installing two instances of FEV-NKF, which grants +3 Luck at the cost of -2 Charisma, would increase your Luck by 3 + 3 = 6 and reduce your Charisma by 1 x 2 + 3 x 2 = 8. The only exception to this is FEV-1 whose penalty is always -2 to all SPECIAL.
Itemized mutations ("FEV inhalators") drop from War Events (before an event starts, you must choose whether to obtain a WE stat or a mutation) and T5/T6 dungeons (Vault 13, Wind of War, Sierra, Vault-Tec HQ, Vault X, Oil Rig, Lost Hill). There's also a 5% x Patch chance of getting a mutation for completing a full Far Go Traders caravan run.
| ☣ Mutagen | Item tag | Bonus | Penalty |
|---|---|---|---|
| FEV-1 | FEV1
|
+1 mutation slot | -2 to all SPECIAL |
| FEV-PMB | ST
|
+3 Strength | -2 Intelligence |
| FEV-CJP | PE
|
+3 Perception | -2 Luck |
| FEV-TCC | EN
|
+3 Endurance | -2 Agility |
| FEV-PIU | CH
|
+3 Charisma | -2 Strength |
| FEV-NMG | INT
|
+3 Intelligence | -2 Endurance |
| FEV-SIS | AG
|
+3 Agility | -2 Perception |
| FEV-NKF | LK
|
+3 Luck | -2 Charisma |
| FEV-TGN | PES
|
+1 ST +1 PE +1 EN | -1 AP |
| FEV-SMF | LAI
|
+1 IN +1 AG +1 LK | -10 HP |
| FEV-DE1 | DTno
|
+1 normal DT | -1 Endurance |
| FEV-PU3 | DRno
|
+5% normal DR | -2% Lethality |
| FEV-DE4 | DTla
|
+1 laser DT | -1 Perception |
| FEV-PU5 | DRla
|
+5% laser DR | -2 Endurance |
| FEV-DE8 | DTfi
|
+1 fire DT | -1 Luck |
| FEV-PU9 | DRfi
|
+5% fire DR | -1% critical effect resistance |
| FEV-DE7 | DTpl
|
+1 plasma DT | -1 Agility |
| FEV-PU6 | DRpl
|
+5% plasma DR | -20 carry weight capacity |
| FEV-D20 | DTel
|
+1 electro DT | -1 Strength |
| FEV-P22 | DRel
|
+5% electro DR | -10 AP Regen |
| FEV-D10 | DTex
|
+1 explosive DT | -1 Charisma |
| FEV-P11 | DRex
|
+5% explosive DR | -5% critical chance resistance |
| FEV-P44 | DREMP
|
+15% EMP DR | -10% damage multiplier |
| FEV-UZC | CRES
|
+10% critical chance resistance | -2% normal DR |
| FEV-WZN | HP
|
+20 HP | -5% movement speed |
| FEV-RVS | HR
|
+20 healing rate | -5% normal DR |
| FEV-LZA | HEAL
|
+20% healing received | +1 AP attack/reload cost |
| FEV-WZB | MD
|
+10 melee damage | +10% attack delay |
| FEV-FTC | MS
|
+10% movement speed | -10% healing received |
| FEV-NJG | AC
|
+100 armor class | -20% noiselessness |
| FEV-PPE | AS
|
-10% attack delay | -10% XP gain |
| FEV-JZP | DMG
|
+10% damage multiplier | -10% maximum chance to hit |
| FEV-ONK | DPB
|
+2 damage per bullet | -1 to all DTs |
| FEV-KUF | -APc
|
-1 AP attack/reload cost | -20% damage multiplier |
| FEV-TRR | AP
|
+2 APs | -3% to all DRs |
| FEV-LSA | APR
|
+20 AP Regen | -8 Stealth |
| FEV-UPD | SNEK
|
+8 Stealth | -10 FoV |
| FEV-WTL | FOV
|
+10 FoV | -30% maximum radiation resistance |
| FEV-ZCY | ACC
|
+5% maximum chance to hit | -1 Intelligence |
| FEV-ALM | CRIT
|
+10% critical chance | -5% damage protection |
| FEV-REB | POWR
|
+10% critical power | -50 HP |
| FEV-ZMK | LET
|
+2% Lethality | -10 lethal damage |
