When calculating the damage against a target with both an Armor Rating and a Resistance - which is applied first? Consider a Wight with Chainmail (AR: 4) and Resistance: Takes half damage from nonmagical weapons, except fire which inflicts normal damage.
A PC crits the Wight with a long spear for 24 damage (choosing to double the weapon dice for the crit).
If AR before Resistance we get 24-4=20, 20/2=10.
If Resistance before AR we get 24/2=12, 12-4=8.
At the table, I ruled AR before Resistance, but can't find a definitive answer in the "DB_Rules_v1.1.pdf" from DTRPG.
For bonus points, does anyone know why the Riddermound adventure (on page 38 of the Core Set Adventure book) calls out that The Wight "has armor rating 8"? Is it simply to increase the difficulty of the encounter or is there another reason?