The A.C.I.B. has need of your special abilities to counter a new threat to civilisation. You have been given a rendez-vous in the warehouse district of the city to receive your mission briefing.
The final boss of the fantastic classic, Edge of Darkness.
This is why GoldSRC is great, the possibilities are endless. You can create tons of interesting setpieces and battles just by shaping brushes and using entities creatively.