Walkthrough: Sonny 2, Zone 5 (Biological/Heroic)

Zone 5 brings the most powerful enemies so far, make sure to boost vitality as much as possible.

1. Riot Police:
   As usual, this zone starts out very weak with and opponent you will see again quite a lot in the later encounters.
   
2. Riot Police, Blood Hound:
   It is a good idea to bring Crystallize along to keep the dog out of the fight for later. By this time, you should build up your poison skills and also keep Reform at lvl 2 to help the team.
   
3. Secret Police (2x):
   Again, keep one of them out of the fight with Crystallize and you should have no trouble here.
   
4. Police Colonel:
   Whenever he is reloading (i.e. flashing orange) hit him with everything you have. As soon as he puts on the grey glow (i.e. guns blazing) just crystallize him and wait until he is vulnerable again. Usually, he will immediately switch to reloading mode.
   Sometimes he doesn't, but by this time you and your team should have a lot of vitality, so you can take some hits from him, especially if you keep Veradux on defensive mode.
   You will need some patience here, but if you exploit his Reloading phase and stun him occasionally to heal the team, he should be toast.
   
5. Felicity:
   That should be a quick one.
   
6. Care Taker, Bloodhound (2x):
   It start to get interesting. You will have to use Crystallize constantly to reduce the number of active opponents to a minimun at all times. Concentrate your attacks on the topmost dog first, and keep the others stunned. Use Leading Strike a lot to regain focus and Reform if necessary. Keep Veradux on defensive.
   As soon as you take down the first dog, it should become a lot easier.
   
7. Riot Police (2x), Android Guard:
   Now we're talking. You will again need mostly Crystallize, Leading Strike, Reform and some supporting spells (I chose Anaesthetic to make them deal less damage and Corrosion to make them take more). Also equip Disrupt, you will need it.
   Crystallize everyone except the topmost Riot Police as often as possible. Use Disrupt on the Riot Police when it uses Perfect Aim. Put Veradux to healing unless you are really healthy. Use Reform if any of your teammates gets below 2k health.
   Btw, you did put most of your points to vitality, right? And hopefully you chose your and your teammates gear according to highest vitality bonusses.
   Another way to ease this fight is to use Disrupt on the Android guard if you can spare it. Whenever it gets low on focus it uses this neat Re-Focusing buff which stuns it for five rounds.
   It could take you one or two attempts, but eventually you will take down the top Riot Guard, making this fight piece of cake.
   
8. Specialist, Android Guard (2x):
   Equip Disrupt at least two or three times. It will help you neutralizing the Android Guards a lot. Crystallize the Specialist at all times, he is quite dangerous. Put Veradux to defensive mode and help healing the team with Reform if necessary.
   
9. Mayor, ZPCI Ambassador:
   Good old nice conversation.
10. City Council (2x):
    Obviously, you need keep one of them crystallized at all times. It takes a lot of patience to bring them to low health. Equip Envenom several times, it helps delivering damage, especially if you use it multiple times.
    Concentrate your attacks on the top council. Use Break and Envenom, and let your teammates do most of the punching. Once you have killed him, things turn out a little ugly.
    Because once a council member has been killed, the other one gets a very nasty focus regeneration buff, that will allow it to cast deadly one-hit-kill spells, making the fight really difficult to win. The easiest solution is to keep him crystallized until his energy shield runs out and then stun-lock it. Stun-locking means to constantly use a combination of Crystallize and Break. In the meantime, envenom him to speed things up.
    
11. Secret Police, Android Guard, Specialist:
    Put your team to Relentless mode. The Specialist is clearly the most dangerous opponent here, so keep him crystallized all the time until nobody else is left. Cast Disrupt on the Android Guard twice to make him knock himself out whenever he is awake and otherwise focus on the Secret Police.
    If you throw in Reform occasionally in case your team requires healing, you should not even need to switch Vera to healing mode at all.
    
12. Specialist, Blood Hound (2x):
    Wow, I hadn't expected such a tough fight. The hounds are incredibly fierce attackers and you need all the vitality you can get here. I managed to take them down with a lot of crystallizing. Most of all the Specialist needs to be kept out of the battle due to his dangerous support spells. It is basically the same tactics as with all fights in zone 5, but it is a lot tougher. Neither the Specialist, nor the Blood Hounds possess any weaknesses and they all have a lot of HP.
    It took me five or six tries and in the end only Sonny survived, but what the heck.
    
13. Secret Police, Android Guard (2x):
    Compared to the previous and following encounter this one is ridiculous. You need Disrupt 3x, Crystallize 2x, Reform 1x and something with a punch.
    Immediately crystallize the Secret Police and keep him that way. Use Disrupt on the Android Guards whenever possible and they will knock themselves out nicely for you. Use Reform if any of your teammates gets below 2.5 or 3k HP.
    
14. The Mayor, Security Cannon:
    Keep the Mayor crystallized until you have taken out the Security Cannon.
    Bring Disrupt two or three times so that you can destroy the Cannons focus whenever it gets above 30. Because then it will fire a very powerful ice spell that does around 5k damage. In the meantime, make sure that you deal more than 300HP damage to it per turn, because that is as much as it regenerates.
    Once only the Mayor is left, he will most likely put on a buff that makes him do 400% damage. Well, sometimes this goes away after a while, much before the 99 turns are over. But if it doesn't, it is a good idea to crystallize him every now and then to help your spells to cool down and heal the team.
    Additionally, I found it quite effective to destroy his focus often, making him rather harmless. After seemingly ages, you will bring him down eventually, finishing the regular part of the game. And, even better, if you have been playing on Heroic difficulty, you will have finally won that Legend badge. Man, that took some time!
    

Woo hoo, congratulations on your Legend achievement! I think I am going for the Corruptor now, but it may take a day or two. There is some ugly stuff in zones 6 and 7. But stay tuned, I will post it as soon as I can!

EDIT: And here you go...

In the meantime, please post your comments on my strategy if you like.