The final battle of Zone 4 puts you against Sinjid's Shadow, along with two Shadow's Shadow.

The two Shadow's Shadow aren't threatening, but they do have a few buffs they can cast that potentially make the fight harder. The real threat of the fight is Sinjid's Shadow, who has a high Speed stat, and is capable of outputting massive damage. Due to this high Speed stat, a lot of strategies for this fight can be very RNG-dependent, as many attacks will miss if you don't have a high Speed stat yourself.

I will be discussing a strategy that will guarantee you beat this fight 100% of the time, that also doesn't require obscene amounts of grinding. I used this method with the Destroyer class, but it will work with any class.

The ability you need to watch out for is Mana Bomb, which will deal more than enough damage to one-shot any of your party members. If Sonny dies, this fight is unwinnable.

Shadow Blend is another very annoying ability, but not nearly so much as Mana Bomb. With Shadow Blend in play, not only will your attacks be very inaccurate, Sinjid's Shadow can deal high damage with Quick Strike, which scales partly off his Speed stat.

In order to deal with Mana Bomb, we will be using the Block ability, which fully shields Sonny from all damage. This ability needs to be fully upgraded, and equipped twice on your Ability Bar. Sinjid's Shadow can only use Mana Bomb when he has 100 Focus, so you only need to use Block when he has 100 Focus. Don't use Block at any other point in the fight, or you could die when the next Mana Bomb comes.

Since we can't use Block to protect against Shadow Blend, I recommend taking Suppression, and casting it whenever Shadow Blend is in effect.

We'll also need some healing, so we'll use Heroic Motivation. It's probably not necessary to fully upgrade but I would recommend it. I equipped three of these on my Ability Bar, but you can get away with fewer, but having more lets you keep your allies alive longer.

We need to recover Focus throughout the fight, and you can use either Blood Focus or Regeneration. I opted for Regeneration since it doesn't need to be equipped, thus freeing up your Ability Bar for other options. I upgraded Regeneration to 4/10 and was fine on Focus throughout the fight.

Lastly, we need to deal damage. Realistically you can use any damage option you want. Expect to miss a good amount of attacks, unless you have high Speed yourself. Just make sure that whatever damage option you use, that you have adequate means to regain enough Focus to win. I would recommend using Cripple for the Speed debuff, to make your other attacks more accurate. But otherwise, anything goes. In my run I used Quick Strike because I wanted to make sure I would never run out of Focus.

If you're following my method exactly, your Ability Bar would look like this:
- 2x Block
- 1x Suppression
- 3x Heroic Motivation
- 1x Cripple
- 1x Quick Strike
You can use other abilities for damage, and you can get away with less healing than this, but this is what I used.

You have several options for allies in Zone 4, though it's not all too important since your allies will die during the fight.

I used Veradux and Amber for this fight. I don't know that Veradux is the optimal pick for this fight, but his damage is decent, especially if he uses Zombie Poison with the Paladin's Gear. Amber is very frail, but she can output some serious damage when she uses Shadow Blend. This is the main reason I brought 3 Heroic Motivation. Just to keep her alive long enough to output some good damage.

You can use whichever allies you want to, you could even take this fight without any allies if you wanted to. The method revolves around keeping Sonny alive and disregarding your allies. They will eventually die, but as long as Sonny stays alive, you're fine.

Starting off the fight, immediately use Block to protect against Mana Bomb. Hopefully it hits you and your allies get to stick around for a while. If not, it's still fine.

After the first Mana Bomb, I like to go after the two Shadow's Shadow first. They're weak and should die quickly. You're free to go after Sinjid's Shadow afterwards.

Always keep an eye on Sinjid's Shadow's Focus. If at any point, he gets back to 100 Focus, he will use Mana Bomb again, and you need to use Block. Use Suppression if he casts Shadow Blend.

Aside from that, just keep doing damage. If your allies are still alive, heal them when they get low. Once they're dead, just keep attacking. Heal yourself when you get low. Block when he has 100 Focus.

It's a long fight, but you will win it.