So...

Oh, I get it, this 2 skill work in pairs! 
Previously, I thought it was 2 different solutions. 

---The custom stat should have a default of 1, max of 1, should decrement by -1 after 5 seconds and should refresh.

These stats are working correctly? I created a similar, but I do not see that the value has changed over time. 

These stats are working correctly?

It works, but a little unclear. 
I will act step by step.

This Steam Tech Recycler(Recombiner) determines how I should implement a starting location. If I implement this feature - it means that Steam Tech Recycler can be carried in inventory, if not - then it should be permanently placed in the starting area. It is very important for me.

If u like to share the files for these skills, i will do what i can to try and help

Here you are! 
https://yadi.sk/d/h1ucMwd_yikA9

ARMADAX - my test NPC.
Now it just dies(RECOMBINER_SELF_KILLER), it seems that the stat check(RECOMBINER_WATCHER_SKILL) does not work.

Got it Kva will get to this as soon as i can, but definitely by the weekend...

Chthon's recent post...

3. Create a hidden looping passive that applies SKILL DISABLE for every active skill with a duration slightly longer than its loop period -- unless that skill's respective stat equals 1.
(I'm not 100% sure in my memory that SKILL DISABLE works on players. If it doesn't SET SKILL COOLDOWN REMAINING would accomplish the same result.)

Is making me think of testing if this will work for your disappearing Recombiner 

Kill Spell is always active, but "disabled" by the looping passive.  The looping passive is looking for the player to be "in range".  As soon as the player is out of range, the looping passive stops diabling the Kill Spell and the Recombiner "dies"...

hmmm

Hey @Kva3imoda I hope you don't mind but I can't seem to solve this on my own and I think we should ask for help 

So hey guys, this is a request for help from 2 modders (Kva and I) who aren't that good with skill-crafting!

Kva's Recombiner unit is supposed to de-spawn if you leave it alone for a short while (10+ seconds).  To do this it has 2 skills which it applies to itself upon spawning...
- a KILL skill which watches for a STAT to be '0'
- a WATCHER skill which watches for the PLAYER to be nearby and, it he/she is, adds to the STAT to keep it greater than '0'

I think I have narrowed the problem down to 2 areas: one is the STAT and how it behaves, and the other is the STAT WATCHER skill and why it isn't incrementing the STAT.

1. The STAT

1.A. In the GUTS combatlog, if you start the STAT with a default value of '0' you can see the KILL skill apply the KILL affix immediately (I put the kill effects into an affix so I could monitor their application) and after 5 seconds (the "TIME_TO_HEAL" duration in the affix) the unit dies.

1.B. If you start the stat with a value of '1' the KILL affix does not apply the KILL affix (so the KILL skill including the STATWATCHER part seems to be working properly).  The STAT is supposed to decrement itself to '0' after 5 seconds, so that the KILL skill can apply the affix (as in 1.A. above). But the KILL affix never gets applied, which means the STAT did not decrement itself to '0'.

Here is the latest code for the STAT.  Hoping someone can critique this pls...

Spoiler (hover to show)

[STAT]
   <STRING>NAME:itemcombiner_watcher_stat
   <INTEGER64>UNIQUE_GUID:7528896369854758345
   <TRANSLATE>DISPLAYNAME:recombiner_stat
   <STRING>TYPE:TYPE_INT
   <FLOAT>DEFAULTVALUE:1
   <FLOAT>MAXVALUE:1
   <FLOAT>INCREMENTVALUE:-1
   <FLOAT>DURATION:5
   <BOOL>REFRESHES:true
[/STAT]

2. The STAT WATCHER/Incrementer Skill

This skill uses a looping 10m-range damage shape to check if the PLAYER unit is nearby (EVENT_UNITHIT).  If it "sees" the PLAYER the Recombiner uses the skill to apply an ADD STAT affix on itself which increments the STAT by '1'.

The damage shape loops once every second, so even if you start the STAT with default value '0', it should increment to '1' after 1 second if the WATCHER SKILL is working properly (the PLAYER is "seen" and the ADD STAT affix is applied).  But since the KILL affix gets applied after 5 seconds (see 1.A. above) I have to assume the WATCHER SKILL is defective somehow. Also, in the combatlog, I never saw the INCREMENTING affix get applied.

I am also hoping someone could critique the components of the WATCHER/INCREMENTER skill...

2.A. The Damage Shape Layout

Spoiler (hover to show)

[Layout]
   <INTEGER>VERSION:4
   <UNSIGNED INT>COUNT:3
   [OBJECTS]
      [BASEOBJECT]
         [PROPERTIES]
            <STRING>DESCRIPTOR:Timeline
            <STRING>NAME:Timeline1
            <INTEGER64>ID:-6122014641013321250
            <INTEGER64>PARENTID:-1
            <BOOL>LOOPS:true
            <BOOL>START ON LOAD:false
            <STRING>NAME:Timeline1
            [TIMELINEDATA]
               <INTEGER64>ID:-6122014641013321250
               [TIMELINEOBJECT]
                  <INTEGER64>OBJECTID:-6122014636718353954
                  [TIMELINEOBJECTEVENT]
                     <STRING>OBJECTEVENTNAME:Enable
                     [TIMELINEPOINT]
                        <FLOAT>TIMEPERCENT:0
                        <STRING>INTERPOLATION:Linear
                     [/TIMELINEPOINT]
                  [/TIMELINEOBJECTEVENT]
                  [TIMELINEOBJECTEVENT]
                     <STRING>OBJECTEVENTNAME:Disable
                     [TIMELINEPOINT]
                        <FLOAT>TIMEPERCENT:0.5
                        <STRING>INTERPOLATION:Linear
                     [/TIMELINEPOINT]
                  [/TIMELINEOBJECTEVENT]
               [/TIMELINEOBJECT]
            [/TIMELINEDATA]
         [/PROPERTIES]
      [/BASEOBJECT]
      [BASEOBJECT]
         [PROPERTIES]
            <STRING>DESCRIPTOR:Damage Shape
            <STRING>NAME:DamageEffect
            <INTEGER64>ID:-6122014636718353954
            <INTEGER64>PARENTID:-1
            <STRING>MAX RADIUS:0,10
            <BOOL>ENABLED:true
            <STRING>UNITTYPE:PLAYER
            <STRING>ALIGNMENT:GOOD
            <BOOL>DOT:false
            <INTEGER>LOOPS:true
         [/PROPERTIES]
         [CHILDREN]
         [/CHILDREN]
      [/BASEOBJECT]
   [/OBJECTS]
[/Layout]

2.B. The Skill .DAT

Spoiler (hover to show)

[SKILL]
   <STRING>NAME:RECOMBINER_WATCHER_SKILL
   <STRING>ACTIVATION_TYPE:PASSIVE
   <STRING>TARGET_ALIGNMENT:GOOD
   <STRING>TARGET:SELF
   <FLOAT>TURNRATEOVERRIDE:-1
   <BOOL>CAN_BE_SILENCED:0
   <INTEGER64>UNIQUE_GUID:8955473621436648416
   <BOOL>DONT_TARGET_SMASHABLES:true
   <BOOL>DONT_STOP_ON_DEATH:true
   <FLOAT>FINDTARGETANGLE:360
   [LEVEL1]
      [EVENT_START]
         <STRING>FILE:media/skills/REMCOMBINER/RECOMBINER_WATCHER_SKILL.layout
      [/EVENT_START]
      [EVENT_UNITHIT]
         [AFFIXES]
            <STRING>TARGET:SELF
            <STRING>AFFIX:RECOMBINER_WATCHER_AFFIX
         [/AFFIXES]
      [/EVENT_UNITHIT]
      [EVENT_UNITHIT]
         <STRING>FILE:media/skills/arbiter/flameaura/strike.layout
         <BOOL>NOSTEALEFFECTS:true
         <BOOL>ATTACHTOTARGET:true
      [/EVENT_UNITHIT]
   [/LEVEL1]
[/SKILL]

and finally the

2.C. Incrementing Affix

Spoiler (hover to show)

[AFFIX]
   <STRING>NAME:RECOMBINER_WATCHER_AFFIX
   <INTEGER>RANK:0
   <INTEGER>MIN_SPAWN_RANGE:0
   <INTEGER>MAX_SPAWN_RANGE:100
   <FLOAT>DURATION:-1
   <INTEGER>WEIGHT:0
   <INTEGER>SLOTS_OCCUPY:0
   [EFFECT]
      <STRING>NAME:itemcombiner_watcher_stat
      <STRING>ACTIVATION:DYNAMIC
      <STRING>DURATION:INSTANT
      <STRING>TYPE:ADD STAT
      <FLOAT>MIN:1
      <FLOAT>MAX:1
      <FLOAT>CHANCE:100
   [/EFFECT]
[/AFFIX]

Any help would be greatly appreciated!

I forget, is this unit summoned or does he spawn on the map?

This unit is an ordinary good/neutral NPC/monster it is not a "pet-type" summon unit.