I haven't really gotten into the imperial city stuff until recently, but I seem to recall the initial patch notes claiming that getting killed by an enemy npc would only cause you to lose 10% of your stones. I'm losing 50% on deaths, however, which I feel is entirely unacceptable considering the number of patrolling bosses you end up having to avoid.
I've spent two nights in the sewers now and only been able to get around 4k stones due to unavoidable deaths. Haven't even been able to get to the 4x modifier. I honestly don't know if I have the patience to grind out the 25k stones I need for the black rose set at this rate.
PS4 / NA
M'asad - Khajiit Nightblade - Healer
Pakhet - Khajiit Dragonknight - Tank
Raksha - Khajiit Sorcerer - Stamina DPS
Bastet - Khajiit Templar - Healer
Leonin - Khajiit Warden - Tank