These are chat archives for BSData/wh40k
The only change a DEATHWATCH Captain in Terminator Armour can make to their default equipment is to replace their power sword with a relic blade.
Sorry for the caps, GW's formatting is the suck for copying:
"USE THE CODEX VERSION OF YOUR MODEL’S DATASHEET, BUT YOU CAN CHOOSE TO USE THE INDEX VERSION FOR
ITS WARGEAR OPTIONS (NOTE THAT IF THE WARGEAR HAS RULES IN THE CODEX, THESE REPLACE THE INDEX RULES)"
it specifically calls out model "wargear options" which is a defined box