Eol Ecthelion

I don't know what exactly are you looking for, but yesterday i was precisely looking a suicide weapon and this worked fine with no colateral damage.

 
  Behavior = WeaponFireSpecialAbilityUpdate ModuleTag_SlamWeaponFireUpdateCast123
SpecialPowerTemplate    = SpecialAbilityWordOfPower
SpecialWeapon = EuthanasiaWeapon_New
WhichSpecialWeapon = 1
StartAbilityRange = 200
SkipContinue = Yes
UnpackTime = 2000 ;;-;; 1000
PackTime = 1300
MustFinishAbility = Yes
ApproachRequiresLOS = No
End
 
 
Weapon EuthanasiaWeapon_New
RadiusDamageAffects = ENEMIES ALLIES SELF
AttackRange = 0
MinimumAttackRange = 0
LeechRangeWeapon = Yes
AcceptableAimDelta = 180
DamageDealtAtSelfPosition = Yes
PreAttackType = PER_SHOT
PreAttackDelay = 0
FiringDuration = 1
AutoReloadsClip  = Yes
ClipSize  = INFINITE_CLIP_SIZE
CanFireWhileMoving = Yes
DamageNugget
Damage        = 1000000
Radius        = 0
DelayTime     = 0
DamageType    = SIEGE
  DeathType     = EXTRA_2
;ForceKillObjectFilter = ANY +HERO SELF
End
End