Okay first of all seeing as I just joined the forums, I just wanted to thank you guys for having such good info on all this zombies stuff (I knew most of it, but it helps out those who don't). The community is quite awesome too
First, I'm going to list the Perma "Perks" I have confirmed myself. And the ones I have heard confirmed. If there are any that you yourself or with a friend have confirmed, post it and maybe a vid would be great too. (Sorry if this is a bit long)
Allows a faster revive without actually buying the Quick Revive perk. From 3 seconds to 2 seconds. (Stacks with actual perk)
How to unlock: Anywhere between 7-20 revives (yes, the variation is a lot between different people)
Deadshot / Overkill
Aim-assist locks on at a way farther distance, headshot damage is increased and the zombies heads explode upon death.
How to unlock: A lot of different sources and confusing guides etc. But how I believe you unlock it is with a double headshot. I will ellaborate later on about this but yes.
Irn-Bru / Barric-Aid
Replaces the wooden planks that you normally use with Steel / Iron planks that takes an extra 2 seconds per plank for the zombie to remove.
How to unlock: Repair barriers and obtain (I think) about 200+ points from repairs alone.
Okay now, on to the main reason for posting. A lot of people have been wondering about why they lose some of their perks. So all day today I have been testing my theory and I think I may have stumbled upon something. All day I have just been using the Mnesia (Upgraded M14) with Juggernog, Stamin-up, Quick Revive & Double Tap II.
I started the game and had "Overkill" (Their heads were exploding every kill) and by round 6 I got an insta-kill and killed maybe 3 zombies with a knife, on round 9 I got a green mist from a double headshot. On round 19 I got 3 galva-knuckles kills and then on round 20, I got another green mist from yet another double headshot.
So I thought, "Hmmm, I am getting a few of those recently." Now, I only used the Mnesia for this game (and just fyi, it's a beast with DTII & Overkill) Then, I got a few galva-knuckles kills before checking how strong my headshots were, it took 2 headshots to kill a full health zombie on round 21. But, on round 22 I got yet another green mist, from another double headshot. So I checked the headshot damage after that and it was a 1 hit kill with a headshot! (might have been a little damaged but can't be sure)
Now, before you go crazy and start spamming headshots to try and get this "thing" to kill zombies with a single headshot on round 50, Listen. I played another game a little later today, using the same tactic.
I bought the M14 and upgraded it and my M1911, bought my perks and Galvas and sat at the diner. I had heard about a possible "Perma PHD" from killing fire zombies, so I was DEFINITELY going to attempt this. I sat there from about round 3 and just farmed headshots, and flaming zombie kills. I got a green flash on round 9 from a double headshot. Now I checked on about round 4 with all the perks I had, how long I could stand in the lava before the lava ticks actually started hurting me. I could withstand 4.
I used the M&S (for the first time) on round 14 & 15 for a few grenade kills. But, I got a green flash on round 16, so I checked my "flame resistance" and to my absolute astonishment I could withstand 7 before taking damage.
Now, I got a few more green flashes that game before dying but my flame resistance didn't change. Although, after using my M&S on round 18, I heard the sound people have been talking about when you lose a perma perk.
So here is my theory/s. If you get a green flash with a specific weapon, you may unlock a hidden (I have no clue what you could unlock. Probably multiple things at this stage) perk or something. BUT, if you get any kills with another weapon, you will lose it (Explains the reason I kept getting green flashes all day, after using other weapons).
Secondly, I think killing flame zombies might be a key to getting a possible perma PHD. I mean think about it, first time zombies can be set on fire, and they cause damage to you when they explode. Treyarch obviously put that in for a reason.
Anyways, thanks for wasting 20 minutes to read all this. And I appreciate it a lot. That is all I have to say and I hope it helps some of you guys. Go out and see for yourself. Come back and post some more info if you find it. Peace.
//Edit: Unlocked a "PHD"perma perk in a 4 man tranzit game today. I was standing in lava and wasn't getting fire on my screen. One of the best things I've ever seen. No clue how to unlock it.