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Fixed it using sound blocking linedefs.

ACTOR IdiotPlayer : PlayerPawn
{
  Speed 1
  Health 100
  Radius 16
  Height 56
  Mass 9999999
  PainChance 20
  Player.DisplayName "Idiot"
  Player.ColorSet 0, "Red",          0x15, 0x1F,  0x12
  Player.ColorSet 1, "Beige",        0x15, 0x1F,  0x12
  Player.ColorSet 2, "Brown",        0x15, 0x1F,  0x12
  Player.ColorSet 3, "Blue",         0x15, 0x1F,  0x12
  // Doom Legacy additions
  Player.ColorSet 4, "Green",    0x15, 0x1F,  0x12
  Player.ColorSet 5, "Yellow",   0x15, 0x1F,  0x12
  Player.ColorSet 6, "Hot Pink", 0x15, 0x1F,  0x12
  Player.ColorSet 7, "Black",    0x15, 0x1F,  0x12
  States
  {
    Spawn:
  SSWV A -1
  Loop
  See:
  SSWV AABBCCDD 4
    Missile:
    SSWV E 5
    SSWV F 5 
    SSWV G 5 bright
	SSWV F 5
	SSWV E 5
    Goto Spawn
  Melee:
    SSWV F 6 BRIGHT
    Goto Missile
	  Pain:
    SSWV H 3
    SSWV H 3 A_Pain
    Goto See
	  Death:
    SSWV I 5
    SSWV J 5 A_PlayerScream
    SSWV K 5 A_NoBlocking
    SSWV L 5
    SSWV M -1
    Stop
	  XDeath:
    SSWV N 5 
    SSWV O 5 A_XScream
    SSWV P 5 A_NoBlocking
    SSWV QRSTU 5
    SSWV V -1
    Stop
 }
}

I see what your saying. But 1. All other monsters in Ambush mode worked perfectly without selecting a player class. And 2: This is the decorate definition for the main player class.[code]ACTOR IdiotPlayer : PlayerPawn
{
Speed 1
Health 100
Radius 16
Height 56
Mass 9999999
PainChance 20
Player.DisplayName "Idiot"
Player.ColorSet 0, "Red", 0x15, 0x1F, 0x12
Player.ColorSet 1, "Beige", 0x15, 0x1F, 0x12
Player.ColorSet 2, "Brown", 0x15, 0x1F, 0x12
Player.ColorSet 3, "Blue", 0x15, 0x1F, 0x12
// Doom Legacy additions
Player.ColorSet 4, "Green", 0x15, 0x1F, 0x12
Player.ColorSet 5, "Yellow", 0x15, 0x1F, 0x12
Player.ColorSet 6, "Hot Pink", 0x15, 0x1F, 0x12
Player.ColorSet 7, "Black", 0x15, 0x1F, 0x12
States
{
Spawn:
SSWV A -1
Loop
See:
SSWV AABBCCDD 4
Missile:
SSWV E 5
SSWV F 5
SSWV G 5 bright
SSWV F 5
SSWV E 5
Goto Spawn
Melee:
SSWV F 6 BRIGHT
Goto Missile
Pain:
SSWV H 3
SSWV H 3 A_Pain
Goto See
Death:
SSWV I 5
SSWV J 5 A_PlayerScream
SSWV K 5 A_NoBlocking
SSWV L 5
SSWV M -1
Stop
XDeath:
SSWV N 5
SSWV O 5 A_XScream
SSWV P 5 A_NoBlocking
SSWV QRSTU 5
SSWV V -1
Stop
}
}[/code]

You might want to review https://zdoom.org/wiki/Actor_flags : 1.3 Behavior Ambush and Friendly

The actors are not friendly. You have set the ambush flag which means that the monsters wake up and attack the player when they [s]hear a sound or[/s] see the player. But that can only happen when you also select a player class.

GZDB/GZDBBF/UDB will show you that something important is missing when the flags are shown in red.

[spoiler][imgur]https://i.imgur.com/1tRQsrC[/imgur][/spoiler]

DB2/DBX does not do that.

[spoiler][imgur]https://i.imgur.com/pKy3XEo[/imgur][/spoiler]

Here it is from the original wad.
[attachment=0]help.wad[/attachment]

Where's your map? We cannot analyze a screenshot.

My map is MAP09, hexen format. On a heavily modded .wad file.
This is the map.
[attachment=0]Screenshot (34).png[/attachment]
None of the monsters here are supposed to be friendly. Even when i summon monsters, they're friendly. No zscript, No mapinfo, No ACS affecting the map.
Please help. :(