No this is not OP or any of that. its really simple. Magma/Corrosive armor both do damage over time.on my V12 DK its like 279 sec for 10.8 secs. the damage there on your death recap is the total damage taken from it. prolly all 10.8 secs. next time your fighting a DK and they dont drop a standard on your head and look all fiery and red. back up!! its Corrosive armor!! The Best Tank Ult in the game! Also I see you took over 500 in burning damage. mine ticks like 50-60 a sec. so another way to tell you had a 10 sec fight. and 289 from cinder storm. which does 30 damage a sec.. Ok no offense here. but it looks like you had a DK all in your face for 10 secs and you just stood there in their cinder storm 'big bubbling fire' and let them burn you down. all the while decreasing your damage 'corrosive armor' giving you miss chance 'cinder storm' and and beating you down with 2 handed atts. yeah.um.. not a good idea to try and go toe to toe against DKs unless you are 1. Ive had some good 1v1 DK fights. or are a tank of the other classes . which may not wanna try it often. I will suggest playing 1 of each class. at least for a few lvls to learn the differences between them and learn the strengths and weaknesses of each. Good luck out there!