It kinda tickles!  For a second he was worried the spell only looked like lightning and was actually fire or something.  Have a stinking cloud funny lightning person!

Some demons take a moment to realize some ignorant spellcaster apparently tried a lightning spell on them (although strangely they didn’t feel their spell resistance interact with it at all).  Others are so caught up in combat or reveling in violence they don’t even notice.  Enough demons respond that she now, in addition to the stinking cloud, has a fireball exploding on top of her, as well as some shimmering rainbow chaotic energy trying to rip her apart, and a few demons charging at her.

One human cultist, triumphantly shouting and holding aloft some bulls horns, is slain by the lightning.

She begins transforming back into her natural form, this isn’t a lone demon but a full on invasion.

A booming voice echos through the city.

”Behold crusader Gods, behold my swarm.  Your city will fall, and your the flesh of your followers feed my hunger…”

Annoying. And annoyances should be crushed, like an insect under her boot.

The counterattacks take long enough that the tickle of her danger sense has her moving in plenty of time to vacate the affected radius. Everyone who stood up against her lightning is now slammed into the ground with force enough to crack plascrete by the time the voice starts blathering.

The ground is not cold iron, but with enough force that doesn't matter!  The demons still have several times the toughness and life force of ordinary mundane humans so the first slam doesn't actually kill them.

If that spellcaster succeeds in giving Terendelev space to think, she might start layering on protective spells and make his job a lot harder.  So, although the moment isn't ideal...

Time Stop

A Gate (from a carefully hoarded supply of scrolls) to the border of Kenabres, far enough from the Wardstone that it won’t interfere (just in case it’s still working that well).

An immense leap at extreme speeds so he has momentum even if the Wardstone ends his Time Stop-

-And his Time Stop has ended but he’s on top of Terendelev before she has time for a spell.  One smooth motion to pin and trip Terendelev...

...but she has the attention to spare and sees him coming, and he can't quite trip her to set up a single decisive and lethal blow.  Her claws and bite and tail barely scratch him, but he still feels immense rage.  His locust swarms across the city abandon what little pretense of normal locust behavior they had to attack without care or caution.

From a mortal perspective (that has the reflexes to observe Deskari in the first place) it will have seemed he simply appeared midair near the apogee of an impossible leap and then landed at extreme speed.

"Deskari!"

Ugly fucker, isn't he. Too bad the only close air support they seem to have is a winged lizard that is not presently flying. Even so, she's taken out walkers that size by herself before. Best to assume her favored approach will be shrugged off same as the smaller ones did. Which begins to make her somewhat angry.

Her lightsaber drops into her hand and ignites, sweeping a bloody crimson blur across the battlefield as she charges to strike at the oversized insect's legs. At her full speed and this distance, it's practically a teleport. A crackling bubble a saber's radius around her keeps her personal space clear of the swarming locusts.

"A gnawing mortal gnat... AHHH"

His insult is interrupted by the realization that he has entirely lost his five of his six legs.  Still, he can actually fly faster than he can walk and he can regrow his legs later, so he presses the attack against Terendelev.  The Wardstone and her are his two most critical targets, if he can take care of them his swarm will ultimately prevail.  He carves great chunks out of Terendelev.  None of his blow are fatal, but just another round of that and she should be dead.  Most importantly, he lands a sting on Terendelev.  Even if he's forced to retreat before he can finish her off, his swarm can devour her from the inside out.

A 'halfling' notes Deskari's pain.  The primary plan called for her to use the crossbow, but it would be better to get the bolt off himself than miss the opportunity entirely.  They fire a crossbow bolt that pierces deeply into Deskari's chest.

Tch. Fine. She leaps up and carves open the thing's thorax.

What are they, some kind of monk?  They are so absurdly fast.

He could take at least a few more wounds like that, but if the monk goes for his head...

Change of plans.  He slashes Riftcarver deep into the ground, opening up a chasm deep enough to reach the caves below and long enough to reach the Wardstone and drop it into the caves below.  With the same slash, he tears open a Gate to the Abyss and lets himself drop down into it.

She wants to pursue Deskari, but she is very badly wounded and wouldn't have much of a chance even if she wasn't. She can feel his poison at work.  She uses a heal, but something about his poison still feels like it is crawling around within her.

Occlus flips over backwards in midair and lands softly on the lizard's head, extinguishing and stowing her saber in the same motion. Good time to pause and take stock of the broader situation.

The demons have fled from the town square with the... monk?  Monk-sorcerer?  Whatever they are, they can make Deskari himself flee.  But elsewhere across the city the demons and cultists continue to fight.  More demons keep teleporting in and the city's defenders are struggling to form any kind of lines of battle.

He directs his swarm to pay careful attention to the monk that dared to challenge him.  Also he has a parting gift for Terendelev.  He directs his swarms at her in case it isn't enough.

It is kind of awkward (maybe even a little humiliating) having a human standing on her head, but the human did just save her from Deskari.  The heal didn't quite get everything, she starts to cast another... 

She loses the spell and screams in pain as fiendish insect hatch within her and gnaw their way free.  It isn't nearly enough to kill her, but the pain is so intense she is practically paralyzed.

Unpleasant to sense. Nothing else she can solve immediately, unknown here as she is, so... Congratulations, Terendelev. You are the top of the priority list.

She kneels down and presses a hand to the top of the lizard's head, rapidly taking in the details of its biological structure. It's certainly... unique. Not that the biologic sciences are her exact area of expertise. She knows enough to guess that those burrowing and biting creatures are the main problem, though. Disable all of those and start extracting from the corpus. There's enough death and dying around that lifeforce is free for the taking. Gather that up and begin investing in repairs starting from where the deepest burrows end and working outward. No sense in fixing something she'll just have to break again getting the parasites all the way out. Speaking of parasites, spend some effort swatting down the swarming locusts in the area.

(A lesser practitioner* would need to concentrate on one task at a time. Occlus is not a lesser practitioner. She splits her focus and is still more effective than ninety-five percent of other people would be.)

*read: literally anyone other than Occlus

Terendelev wants to say to tell the monk to focus on the swarms around the area, she'll live thanks to her heal, but actually that was the single most horrific sensation she's felt in her long long life, so she'll let the monk get the rest of swarm out of her.

She'll take care of some of the swarms that are starting to gather with a blast of her icy breath.

He can feel the swarms dying, it looks like Terendelev will live.  He is tempted to go back through his Gate before it closes, but the Crusader Gods are likely paying close attention now and might bother to intervene to smite him directly.  He carefully notes every trait he can about the monk, he'll see about having her assassinated later.

Well, 'Darth Occlus' probably isn't a Deskari cultist, there aren't many objectives Deskari could have the would lead him to allow himself to be harmed and to fail to kill Terendelev.  But he isn't ruling out the possibility that she serves some other Evil God or Entity.  For now he'll focus on killing the retreating demons.

Once her work on the lizard is completed, Occlus vaults gracefully down to the ground.

"Is that sort of creature usual here?" she asks.

“We’re on the border of the Worldwound, so yes, although this the worst attack we’ve had in decades, and I believe the first time that Deskari himself has risked showing up on the material plane.  Are you unfamiliar with demons?  I would assume so from your attempt at using a lightning spell (…or whatever that effect was) against them.”