One thing I've always loved about Dragon Age and Mass Effect games is skill combos. The ability to combine certain skills in a potent concoction of chaos makes me feel like a mad scientist, and nothing is more satisfying than experimenting with different abilities. Mass Effect: Andromeda is carrying the torch forward with a newly evolved combo system that will make us all into crazy skill-brewers.
BioWare's latest Mass Effect: Andromeda trailer shows off more nifty combat tips, character skillsets, companions, and our main attraction, combos. The anatomy of a power combo is "primers" and "detonators." Prime skills initiate the power combo, and detonators trigger the actual combo. In Dragon Age: Inquisition, combos had "starters" and "detonators," all of which delivered different effects that allowed for a tactical multi-faceted strategem. But Dragon Age has cross-class combos, and since Mass Effect: Andromeda doesn't actually have classes, the game opens up many more opportunities for havoc-inducing combos.
Power combos are triggered when successively casting abilities and powers from the Tech, Biotics and Combat trees. For example, you can cast Cryo Beam (Tech) and then Lance (Biotics) to trigger a potent power combo. Interestingly enough, this combination detonated a Cryo Combo, hinting that the "primer" skill will designate the affects of the combo itself. We don't know exactly what a Cryo Combo does, but I'd wager it slows enemies down while dealing frost/ice damage.