Source: Starfinder Core Rulebook p.352
Level Mystic 5; Technomancer 5
Targets or Area one creature, object, spell, or spellcaster; or a 20-ft.-radius burst
This spell functions like dispel magic, except it can end more than one spell on a target and it can be used to target multiple creatures. You choose to use greater dispel magic in one of three ways: a targeted dispel, an area dispel, or a counter.
Targeted Dispel: This functions as a targeted dispel magic, but you can dispel one spell for every 4 caster levels you have, attempting a separate dispel check for each spell. Additionally, greater dispel magic has a chance to dispel any curse that remove affliction can remove, even if dispel magic can’t dispel that effect. The DC of this check is equal to the curse’s DC.
Area Dispel: When greater dispel magic is used in this way, the spell affects everything within a 20-foot-radius burst. Attempt one dispel check and apply that check to each creature or object in the area, as if it were targeted by dispel magic. If you don’t specify spells and there is more than one possible spell on the target, your targeted dispel attempts to dispel spells at random. Magic items themselves are not affected by an area dispel but additional magical effects on them may be dispelled.
For each ongoing spell effect whose point of origin is within the area of the greater dispel magic spell, apply the result of the dispel check to dispel the spell. For each ongoing spell whose area overlaps that of the greater dispel magic spell, apply the result of the dispel check to end the effect, but only within the overlapping area.
If an object or a creature that is the effect of an ongoing spell is in the area, apply the result of the dispel check to end the spell that conjured that object or creature (returning it whence it came) in addition to attempting to dispel one spell targeting the creature or object.
You can choose to automatically succeed at your dispel check against any spell you have cast.
Counter: This functions as countering with dispel magic, but you receive a +4 bonus to your dispel check to counter the other spellcaster’s spell.