Platform:
Windows 7 Professional Service Pack 1 (64-bit)
Intel Core2 Duo E6750@2.66GHz
6.00GB RAM
nVidia GeForce GTX560Ti
(Windows and nVidia drivers fully updated)

ISP:
Virgin Media

Type of Internet Connection:
Fibre-optic Broadband

Internet Connection Speed:
30Mbps down, 9Mbps up

Date & Time:
8th April 2019 10:36am BST (GMT+1)
10th April 2019 01:07am BST (GMT+1)

Frequency:
1. Always

Character Name:
Haldarn

Race:
ElvaanM

World:
Shiva

Main Job:
Red Mage

Support Job:
Ninja

Area and Coordinates:
Stellar Fulcrum

Party or Solo:
Solo (with Trust)

NPC Name:
None

Monster Name:
Kam'lanaut / Ethereal Scrivening

Steps:
  • Enter the High-tier Battlefield ★Return to Delkfutt's Tower (Very Easy lv113).
  • Summon Trusts, buff, engage Kam'lanaut in melee.
  • When Kam'lanaut is at low health, he summons the first Ethereal Scrivening, which I destroy.
  • At this point he summons a second Ethereal Scrivening.
  • As I attack this (maybe Kam'lanaut uses a specific move, or is summoning a third?), the game crashes straight to Desktop with an nVidia exception.
  • The second time I attempted this, I had turned shadows off in the Config Menu, but no change.

I don't do HTBFs often, but I ran into a similar problem with the others that I've tried. It took 5 attempts before I could get all the way through the AAGK battle (for the Trust) and 2 attempts at Eald'narche (for the mount). Burning 10x Merits every time is a pain, but I haven't even attempted the battlefields that require items rather than the KIs, as I don't want to lose them.
I can stay logged in for dozens of hours, idling, questing, farming, travelling, doing Assaults/Skirmishes or any other solo content battlefields without a single crash.