While creating a functional Gate is way above our capabilities, we can create a broken one. The Gate tries to suck the target into the Shadowrealms in a chaotic manner, resulting in severe tissue damage. What's more, since inert matter generally can't go into Shadowlands, the timespace irregularities will cause more damage to heavily armored targets, as they will be crushed by their own armor. Hellgate cannot actually do much to the armor itself, but ignores it completely instead. Results of using this spell are highly unpredictable.
Complex Spell: goes into the THIRD slot of the Gray Spellbook. 3 Freshness to use.