adding the effect:

add this to CIV4EffectInfos.xml of your mod, the file can be found in: "...\Assets\XML\Misc"

		<EffectInfo>
			<Type>EFFECT_PPC_LASER</Type>
			<Description>particel projection cannon</Description>
			<fScale>0.5</fScale>
			<fUpdateRate>1.0</fUpdateRate>
			<Path>Art/Effects/PPC/fx_redlaser.nif</Path>
			<bIsProjectile>0</bIsProjectile>
		</EffectInfo>
		
and add the folder PPC to the "...\Assets\art\effects" folder of your mod.

If both folders arent existing, simply create the folders and copy the CIV4EffectInfos.xml form the Beyond the Sword Assets (same place as above),
after copying add the lines above to this file.