okay so addArray isn't even required.

Engine/source/T3D/fx/lightning.cpp

@@ -265,9 +265,7 @@ void LightningData::initPersistFields()
 
    INITPERSISTFIELD_SOUNDASSET(StrikeSound, LightningData, "Sound to play when lightning STRIKES!");
 
-   addArray("Thunders", MaxThunders);
    INITPERSISTFIELD_SOUNDASSET_ARRAY(ThunderSound, MaxThunders, LightningData, "Sounds for thunder.");
-   endArray("Thunders");
 
    addField( "strikeTextures", TypeString, Offset(strikeTextureNames, LightningData), MaxTextures,
       "List of textures to use to render lightning strikes." );