if u want to find the secret obliviator gun follow these steps
step 1: kill 5000 magestic men and cars
step 2: get 5000 d.n.a NOTE: it will not work if u use the d.n.a cheat
step 3: get all probes in santa modesta
step 4: go to union town
step 5: collect all the probes in union town
step 6: then go to mother ship and buy every upgrade
step 7: go back to capitol city destroy the white house and thier should be a mission but this mission wont be a yellow marker like the othhers it will be blue
step 8: once you have done the mission go to mother ship go to buy upgrades and thier will be a new upgrade for 20,000 d.n.a called the obliviator this is in cryptos upgrades this gun is good because it can blow up buildings why u walk on foot but if u shoot a person with it they turn in to 1 of those magestic mutants!