Question: what is the helghast home planet in killzone shadowfall
Answer: Following the Petrusite detonation that rendered the planet Helghan uninhabitable in Killzone 3 ( an event now referred to as `` The Terracide '' ) , the ISA grants refuge to the Helghast survivors on the planet Vekta , allowing them to colonize half the planet , with that half of the planet dubbed New Helghan .