In Type Soul, unlocking Devil Trigger adds a powerful boost to your gameplay, but getting it isn’t easy. You will need to pass through three Rings of Hell and fight the Virgil Boss to get the Devil Trigger. However, Virgil is one of the most difficult bosses in Type Soul, as once his HP becomes low, he will unlock his own Devil Trigger mode. We're here to help smooth out this process, so keep reading.
How to Get Devil Trigger in Type Soul

Devil Trigger is one of the most coveted Universal Weapons in Type:// Soul. It is the ideal weapon for any Arrancar or Hollow, and replaces your sub mode. Do note that this is not viable for Fullbringers, as they get their weapons based on element.
You can only get it by beating the hardest boss currently in the game named Vergil in a 1v1 fight. For that, you need to complete various steps, which we've mentioned below.
How to Defeat Virgil Boss in Type:// Soul
You first need to complete Ring One and Ring Two. After you clear both rings, you will unlock access to Ring Three. This is where the Devil Trigger quest actually starts.
Once you enter the third Ring, you need to talk to the NPC named Yin. You can locate Yin by pressing the comma (,) once you've entered the third Ring of Hell. When you arrive at Ring Three, you will encounter a massive tornado that acts as a barrier. You need to go straight through it and into the main farming zone (it is tied to your server). You need to defeat enemies here to gain the experience and resources for the next fight.

After you have farmed up enough go straight toward the main boss, Vergil. You can teleport directly to him by finding the 'Lawn...Chair?' NPC in the third Ring. This is located towards the north of the Yin NPC.
When you get to Virgil, it will be arguably the toughest boss fight yet. He will use all the critical attacks from the Yamato weapon. You need to learn his patterns if you want to survive and win the fight. Keep moving and avoid staying in one place too long.
When Vergil’s health reaches 50%, he will activate his Devil Trigger. This will be the hardest part of the entire fight. His attacks get faster and deal more damage. If you can time your dodges and manage to beat this boss, you will gain access to the Devil Trigger Mode which you can unlock in the Skills Tab.
For more on Type Soul Roblox, check out How to Get Ancient Vastocar in Type Soul or How to Get to Hell in Type Soul on Pro Game Guides!