Tossing my hat into the Hearth Guard War Machine ring since it's kind of a shame that the Master Engineers don't get to stretch their legs right now, keeping in mind that I am Runesmith Ungradum Bungrimsson and that this is entirely tertiary to Maraz...
Brynazrildron A Gnolrik
Shining Silver Lightning of the Wise King (IE Grungni)
A massive Bolt Hurler, the main body made of Pure Gromril lacquered a shiny silver. Knotwork made from Azrilwut flowing along the thing depicts Mighty Grungni and the construction of Drongrundum, filigreed with gold writing exhorting him to make the bolts strike like the lightning and the thunder from the vast sky above, to fall as destructively on the enemy as his furious hammer once did as he struck at his foes. A legend involving Grungni from each Major Hold lines the limbs of the Bolt Hurler itself, carved in the most precise detail possible, while the axles of the wheels are capped in gold of the highest purity, carved with a map of the Karaz Ankor entire, precious jewels encrusted in it where each of the Major Holds is located on the map.
Runically, it bears...
The Master Rune of Lightning Strikes: Fed the blood of an Elder Dragon Ogre Shaggoth, each bolt will strike home with the force of a lightning bolt, slamming down and destroying everything it strikes as surely as Grungni's own hammer once did.
Rune of Grungni: A Dragon Ogre Shaggoth's Heart, given up in offering, in supplication, to the God of Lightning. Such power will fill the bolts with power, with energy, with crackling, bursting, burning electricity, every blow an invocation of the bearer of Drongrundum to smite all on the field.
Rune of Penetrating: Barazgal, melted, smelted, burned away so that the First Miner might pick and cleave and rip into the foe as he once ripped into the stone and the rock in search of wealth.
Every bolt will be a shot of lightning to the enemy, cracking any armor, breaking any defense, tearing apart any formation as the force of Grungni himself strikes them, every blow an invocation of him and his fury.
Grozdrengi
Many Slayer
A fairly simple Bolt Hurler, made of Dronwut stained red, trimmed with gold lacquered white and tastefully accentuated with emeralds at key points. The gold is in the form of knotwork tracing along the contraption, the emeralds studding points along its mechanistic working: a testament to beauty in function. Subtle by the standards of most of Snorri's work.
At least, until it actually fires and evaporates a few enemy regiments with freezing cold shrapnel.
Runes:
M. Shardthrower (???): The biggest X.Factor in my mind, in that we don't know it or what its reagent would be. Ideally we already have at least the T2/T3 form so this can be a moderate investment/Moderate return build. When ammo strikes home it will shatter, tossing hard shrapnel absolutely everywhere.
Cleaving (T2-T4 Cockatrice Eye): So the shrapnel can break through enemy armor, with effect of Cleaving emphasized by the cockatrice such that whatever shoddy crap gets put in its way, it can still just break through like so much air.
Penetrating (Wyrren Duraz???): Cold, hard steel dripping with frost, yet further punching through whatever it strikes as well as freezing the enemies it hits.
In short, transforming a Bolt Hurler into both a Single-Target and Regimental War Machine that can grind through both by tossing up clouds of freezing shrapnel and punch through more dangerous single targets as well.
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