Free Green Flame Assassin (Demon Lord series, book 2) by Morgan Blayde

Haziar said. 
I felt an immediate urge to rip his head off and play soccer with it.  “The only thing I ever do efficiently is kill.”  Before I could demonstrate, a window at the far end of the room exploded inward.  Something toddler sized, bristling with segmented legs, hurtled into the room.  Shell-backed, jade green, it bounded off the floor like a ginormous superball, and came spinning at the bar.
Kimberley looked startled.  This thing had slipped in under her psychic radar; so much for her second sight.  She put a hand over her mouth, stifling a scream.
Haziar’s sword scraped free of its scabbard.   He leaped to meet the pint-sized monster.  It grounded itself, clawed at the floor for traction, and wobbled inside his guard, avoiding the blade.  The demon creature popped up and mashed itself against his torso.
“What the fuck is that?” I lunged across the bar, slid off to the other side, and put the envoy behind me.
By this time, William and Achill had slammed out of their chairs, leaping toward the action.  I had my PPKs out, waiting for an opening.  A cloying brimstone stench told me this beast was fresh from some far away hell-dimension.  Haziar whirled, one hand prying at his attacker, his other hand using his sword to hack.  A segmented length dropped from inside the shell, arcing back up to hang behind the demon like a scorpion tail.  Instead of a stinging barb, the tail ended with a curve-bladed dagger made of chitin.  
William snagged the tail with his claws, and kept it from stabbing Haziar’s face.  Achill seized two of the creature’s legs, trying to disengage them.  Already, the fey guard’s shirt was in tatters with bloody scrapes across his upper torso.
“It’s a taxrasque,” Achill said.
I vaguely remembered Red Fang once talking about these things.  “Aren’t they supposed to be bigger than that?”
“It’s young, lost, and hungry.”  Kimberley sounded breathless and scared, but was trying to help out with what little she knew.  Her eyes were wide, peering into some alien dimension.
“I see a world of eternal night, where black waves wash tourmaline shores.” 
It gave up on Haziar, jumping on William’s face.  He managed a muffled “Fuck!”  His supernatural strength allowed him to pry partially free.  The demon’s tail whipped up, hunting an opening at William’s face.
Waving Achill back with one gun, I used the other PPK, firing at the base of the tail where it emerged from the shell.  I figured any shots getting through or past the tail would hit the shell and be deflected safely away from William, not that I cared if he caught a slug or two.
The shock of bullets loosened the taxrasque enough for William to toss it aside.  The baby demon hit on its back, flipped over, and skidded to a stop.  A bulbous head poked out of its shell opposite the tail which was dripping a straw-colored poison.  Its leaf green eyes blazed.  It opened a beaked mouth with serrated edges, hissing like a Texas cockroach, waving its stubby green tongue.
The taxrasque had two wolves and a very pissed off fey circling it warily.  I don’t think it knew who to go for first.  The way it had changed partners, going for William, giving up Haziar, made me think it was undirected, no more than a diversion.  I think the plan had been for it to keep us all busy up here while the Autumn Court fey broke into my nerve-center in the basement.  His plan would have worked if he’d sent the taxrasque in just a little sooner.
“Hey, William,” I called, “why don’t you hump it to death?”
“More your type than mine.”  His face had furred over, growing wolfen.  His bared teeth were white and fanged.  His shirt tore at the seams as he hunched, his posture going more bestial.   He snarled, eyes flashing yellow.
About then, I noticed Osamu had joined the party, coming up on my right.  He was unarmed, the calm at the center of a storm.  He loosened his tie and shot me a