Morty knows he shouldn't be screwing around with multidimensional shit. It's dangerous, it's impractical, it's blah blah blah. But it's a potential key to unlimited energy, how does nobody see that? He's built a dimensional siphon (it kind of looks like a cardboard box with a funnel and a TI-84 taped to it, but it damn well works), keyed in the dimensional coordinates to a random plane, and by God he's going to use it.
He flips the switch and waits for the energy bar to fill up.
It does! It fills up very rapidly. Then it explodes, along with the box. There's rather more smoke than there should be, and once the smoke clears someone is standing there.
"Oh dear," Morty says faintly.
"...Without, say, first turning it airborne and wiping out some Northeast? I'm all for killing ebola without doing that."
"Yeah, the vaccine for the airborne version got everybody het up about wiping out regular type ebola before it mutated again, so we've got that too. Uh, speaking of which, you got shots at some point, right? Because I am envisioning a plague blanket scenario featuring you as the one using the blankets, and it is unpleasant."
"I got many many shots on Thursday. I whined to Alli about the lump in my arm. She told me to get my butt home if I wanted her to do something about it and otherwise to shut up."
"Ah, good. You don't have to worry about... I'm not even going to pick a horrifying devisor plague to mention. You don't have to worry about those, hooray."
"Hooray. Of course, someone may invent a new one, but if it doesn't progress with astonishing rapidity we can just call in one of Alli to take care of it and vice-versa. For me. The rest of you do not have the luxury."
"Yeah, devisor plagues suck. Mom always locked us in a bunker whenever some asshole came up with one. Now I basically can't get sick, which is nice. Though if I do get sick then I get put in a bunker while they chemically sterilize every inch of my body, because diseases that can hit an ex-5 are a bad thing."
"Makes sense. There is... no known limit to what gemini healing can handle, but there's a reason I'd summon only one of Alli and leave one at home if something came up."
"...Yeah. But there's enough healers around that if something did come up they could get rid of it. The only reason I always got bunkered was that we couldn't get treated without revealing that we existed. The plague management system works pretty well by now. Hardly anybody even dies from plagues anymore, they just import a healer or somebody with good medical devises and keep people quarantined and healed until they can devise a cure."
"Good, good. I will... take home your cure for ebola-and-friends and have a plaque erected to the people who were lost in the acquisition of your disease control measures."
"That would be one of those absolutely fucking not areas of magic. Much, much worse than BITs. No resurrection. Don't do it."
She conjures up a sparkleball, which sails upwards and bursts into a firework.
"Same base spell, different secondary. The secondary basically says 'hey illusion, it's time to explode now!' Lots of fun."
"Can secondaries be applied to multiple spells? That is, can you make arbitrary illusions explode in just that way?"
"That one, yeah. If I did it to a regular glowball it'd be more of a flashbang effect; if I did it to a fire illusion it'd be a fireball; if I did it to an illusory bunny it would be unpleasant. Xan did that to his opponent in his combat finals last year. She practically went catatonic. The bunny grenade was definitely Xan's finest hour."
"We've met. I like Leo better, of the two, and don't see myself being pen pals with either one in five years."
"Yeah, that's valid. 'Lots of fun' doesn't mean, uh, 'universally loved.' Or 'tolerable to more than about a dozen people in the world,' maybe."
"What do you like better about Leo? Unless it's just his sheer not-Xan-ness, which I can respect."