Background

“In the Summer of the Thyatian Year One Thousand and Six as the armies of the Master of the Hule were in full retreat, a great Meteorite fell from the sky impacting in Southern Glantri near the Principality’s Border with the Republic of Darokin. The subsequent cataclysm killed every living thing in a six hundred mile radius leaving a lifeless desolation west beyond Sind, east beyond the Kingdom of Karameikos, south to the Capital of Ierendi and north to the northern edges of Wendar. The Known World is gone.”

- Captain Gregor Radu, Thaumont 12, AC1007

[Image: Great Crater map]

http://pandius.com/great_crater.png

The Meteorite

Predominantly iron, a meteorite, some 17,000 feet in diameter, impacted at a velocity of 38,028 miles per hour at an angle of 45 degrees.

The Impact

The initial impact excavates a crater almost 32 miles in diameter and over 11 miles deep as vast volumes of rock are thrown out as ejecta. There is large rock mass displacement out beyond 28 miles from the centre of impact.

The Fireball

The fireball was 59 miles in radius, and beginning five seconds after impact, generates such radiation lasting 19 minutes that every living thing within 550 miles suffer full body third degree burns. Those between 570 and 600 miles suffer full body second degree burns, and those caught outdoors beyond 600 miles suffer first degree burns beyond which the fireball soon drops below the horizon. Trees and grass ignite out to a 570 miles radius. The wildlife and livestock death toll will be total.

Thermal Radiation Burns

The thermal radiation burns from the fireball last 19 minutes, meaning damage is taken every round for the full 19 minutes (114 rounds).

First degree burns (3d6/round)
Second degree burns (2d6/round)
First degree burns (1d6/round)

The Quake

The impact triggers a shock wave of 9.5 intensity creating total destruction as it travels outward including subsidence of subterranean caverns as the surrounding land mass is physically altered. Land slides on and around nearby mountain ranges.

The Air Blast

A powerful wind blast due to pressure rolls outward blowing everything away in its path. Close to the epicentre, mountain-tops are sheared off.

The Ejecta

The crater material is pulverised and thrown outward at incredible velocity. It can be considered broken land out to a 36 miles radius and boulders strewn out to a 200 miles radius.

A Timeline of the Impact Effects

[Table: Timeline]

Tables

[Table: Timeline]

Time	Effects
+5.16 sec.	59 mile radius Fireball Thermal Radiation for 19 minutes
+20 Miles
+6.44 sec.	Inside Fireball Inside Crater Large Rock Mass Displacement Quake (Total destruction)
+1.63 min.	Air-blast (16,900mph)
+28 Miles
+5.16 sec.	Large Rock Mass Displacement Thermal Radiation 3^rd degree burns, ignites trees, wooden structures, grass, paper.
+9 sec.	Quake (Total destruction)
+1.6 min.	Ejecta (2,210ft dia. @ 1,050mph)
+2.28 min.	Air-blast (11,500mph)
+36 Miles
+5.16 sec.	Thermal Radiation 3^rd degree burns, ignites trees, wooden structures, grass, paper.
+11.6 sec.	Quake (Total destruction)
+1.82 min.	Ejecta (1,040ft dia. @ 1,186mph)
+2.93 min.	Air-blast (8,620mph)
+44 Miles
+5.16 sec	Thermal Radiation 3^rd degree burns, ignites trees, wooden structures, grass, paper.
+14.2 sec.	Quake (Total destruction)
+2.02 min.	Ejecta (569ft dia. @ 1,306mph)
+3.58 min.	Air-blast (6,850mph)
+50 Miles
+5.16 sec	Thermal Radiation 3^rd degree burns, ignites trees, wooden structures, grass, paper.
+16.1 sec.	Quake (Total destruction)
+3.07 min.	Ejecta (288ft dia. @ 1,395mph)
+4.07 min.	Air-blast (5,910mph)
+100 Miles
+5.16 sec	Thermal Radiation 3^rd degree burns, ignites trees, wooden structures, grass, paper.
+32.2 sec.	Quake (All structures destroyed)
+3.07 min.	Ejecta (48.5ft dia. @ 1,954mph)
+8.13 min.	Air-blast (2,640mph) 90% Trees blown down
+200 Miles
+5.16 sec	Thermal Radiation 3^rd degree burns, ignites trees, wooden structures, grass, paper.
+1.07 min.	Quake
+4.4 min.	Ejecta (6ft dia. @ 2,727mph)
+16.3 min.	Air-blast (1,130mph) Wooden Buildings blown away 90% Trees blown down
+300 Miles
+5.16 sec	Thermal Radiation 3^rd degree burns, ignites trees, wooden structures, grass, paper.
+1.61 min.	Quake
+5.47 min.	Ejecta (1.75ft dia. @ 3,290mph)
+24.4 min.	Air-blast (649mph) Wooden Buildings blown away 90% Trees blown down
+400 Miles
+5.16 sec	Thermal Radiation 3^rd degree burns, ignites trees, wooden structures, grass, paper.
+2.15 min.	Quake
+6.41 min.	Ejecta (9 inch dia. @ 3,744mph)
+30 min.	Air-blast (423mph) 90% Trees blown down Wooden Buildings blown away
+500 Miles
+5.16 sec	Thermal Radiation 3^rd degree burns, ignites trees, wooden structures, grass, paper.
+2.68 min.	Quake
+7.27 min.	Ejecta (5 inch dia. @ 4,168mph)
+40.7 min.	Air-blast (299mph) Wooden Buildings blown away 90% Trees blown down
+570 Miles
	Thermal Radiation is reduced Second Degree Burns
+600 Miles
+5.16 sec.	Thermal Radiation 1^st degree burns
+3.2 min.	Quake
+8.07 min.	Ejecta (3 inch dia. @ 4,460mph)
+48.8 min.	Air-blast (223mph) 90% Trees blown down Wooden Buildings blown away
+700 Miles
	Fireball below Horizon
+3.76 min.	Quake
+8.85 min.	Ejecta (2 inch dia. @ 4,745mph)
+56.9 min.	Air-blast (173mph) 90% Trees blown down Wooden Buildings Collapse
+800 Miles
	Fireball below Horizon
+4.29 min.	Quake
+9.6 min.	Ejecta (1 inch dia. @ 5,000mph)
+1.08 hrs.	Air-blast (140mph) 30% Trees blown down Wooden Buildings Damaged
+900 Miles
	Fireball below Horizon
+4.83 min.	Quake
+10.3 min.	Ejecta (half inch dia. @ 5,242mph)
+1.23 hrs.	Air-blast (116mph) 30% Trees blown down Causes roof damage

Images

[Image: Great Crater map]

The Great Crater by Sean Robert Meaney, 2017. Used by permission of the author.

https://drive.google.com/open?id=0B63TLs3TewqybFBuVEpiQm1lY1k

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