Originally Posted by
G0RM
Due to my headcanon "Magik Throws Fights”, I never believed 1) that Hope actually used Illyana's powers or 2) that Sinister actually overcame Magik's mental shields.
It's been shown that as Hell Lord of Limbo, Illyana can block all access to Limbo against all rivals. Not that Hope is worthy of being called a rival, but Magik's Hell Lord mastery, and Belasco's & Dormammu's spells have been shown to defeat Illyana's mutant powers in the past.
If Hope did temporarily copy Magik's powers to travel to Limbo, once Hope arrived, she'd be in a completely different dimension from Magik, would lose the powers, and so would be trapped as demonchow.
My "no-prize" explanation is that Magik's "Extraordinarily Powerful and Sophisticated Psionic Shields" tricked Sinister into believing she was under his control, at which point Magik was the one who ported Hope to & from Limbo...
Regarding teleporting through Limbo, except for the period Limbo was inside of her, all travel was through stepping disks & through Limbo. (While Limbo was within Magik, they traveled through swirling flames & demonic images to locations, the stepping disks & Limbo being non-existent at that time.)
Back during Claremont's reign, I spoke with him about Illyana simultaneously summoning a pair of disks, held parallel and separated by an inch or two in Limbo, which would let her effectively bridge portals on Earth.
Trickier would be if in addition she separated the disks by a second or more, which would allow them to arrive at destination before departing, slowed by delays, or numbed by time dilation. (If time in Limbo is maintained faster than on Earth, bloodflow could be reduced or effectively stopped, letting her 'knock out' or paralyze opponents, like the way an arm or leg "falls asleep" when bloodflow is restricted.)
Different artists are inconsistent, but if stepping disks are transparent to light or other energies, it might be possible to spy, or even have effective precognition using such methods, plus lasers or magical blasts generated in Limbo could be used on Earth. (Holding portals in front of your eyes separated by a second would allow a second of foresight, plus I mentioned earlier dropping one side into the ocean, Earth's core, or the Sun to deliver blasts of water, lava, or plasma.)
(Separating disks in time might be limited though, because as a Hell Lord, Illyana can't overlap herself in time. Until Bendis, stepping disks had never caused anyone to overlap themselves outside of Limbo, and Illyana Hell Lord had never been seen to overlap herself. <Yes with Little Snowflake, but not Empress Magik.>)