Warriors have a few traits that conditionally buff toughness:• Thick Skin - +180 toughness when above 75% hp• Spiked Armor - +150 toughness when you have retaliation. Gain 5s of retaliation when you block or are hit by a crit. --> You likely didn't have retaliation as a buff as your combat log shows you getting hit by necros shades, well of corruption and loss aversion. • Your screen shot is at a keep and you have the Presence of the Keep buff on you which is giving you +100 toughness (also +100 to power, precision, vitality stats). --> Based on the above, subtract 280 toughness from the value shown in the display window in the screen shot You don't know how buffed the warrior was (i.e. might stacks on him, bloodlust sigil stacks, stacks of Insight, vulnerability on you). Investing in toughness suffers diminishing returns: for each additional point of toughness you add to your build you get incrementally less and less reduction in damage. Direct damage continues to scale in a linear manner. The system was setup like this likely as a way to prevent a situation where a player could create an unkillable tank in pvp. (Sidenote: HoT especially took a massive dump on this system by adding flat percentage damage reduction modifiers and food to the game). Wastrel's Ruin has a +100% damage modifier if it hit you and you aren't using a skill at the time. If you were using a skill at the time he hit you, he would have crit you for 4,737 damage instead of 9,475. TLDR:• Stacking toughness is not the best way to go• The 9,475 damage hit you took is legit