[ Strange tends to launch into crystal conversations without much preamble or hellos either, so he appreciates the brusqueness; it cuts the fat. He double-checks the sending crystal name attached to the unfamiliar voice — Isaac, then — and then gladly rolls with it. ]

Here: offensive, for the most part. Bursts of telekinesis or blasts of energy, and summoning arcane shields and weaponry: shields, flaming swords, whips, restraints, and the like. From my reading and witnessing others’ abilities, I believe the most comparable local analogues would be force magic and spirit magic, for the summoned constructs part.