This sigil is used to focus energy from a curse into sort of a sniper shot in a sense. It will absorb the energy from the curse, focus it onto the target, and push it directly at them.
Middle: target with a target on them, this will be the focused shot of energy
Crystal shape: pulls the negative/dangerous energy towards the center, this is the absorbing chamber
Outside rectangle: should any energy be released, the rectangle with trap it inside long enough for the crystal to absorb it. This ensures that the curse can be recycled and recast in one ritual