Thanks for the feedback man, ill look into your suggestions. Also the "burst" part is really only directed toward enemy squishies, not the whole team.

hello, i saw when your build came out quite a while ago, thought it was "ok", but never looked into it, today i was searching through and saw yours didnt have a single comment/vote, and thats how i ended up here :D. anyways, about your build... i think your build is decently balanced, but also a bit contradictive. let me explain: your title, the immortal burst, and your items match that, although your masteries are set full defense category, and dont get me wrong i love the defense category for morde, so many benefits!!! but i would just like to point out that for a "burst" build, to throw in 9 mastery points into the attack category for the ability power column is pretty useful. uhh runes look good, showing powerful late game, and some early game balancing because he is so weak early game. onto items... it looks pretty good for a burst build, even though its basically just another off-tank build, with a little extra "power" thrown in. lol. i thought at first you should have taken warmogs instead of sunfire, but looking at it from your standpoint, you dont have armour unless you get sunfire, and the AoE helps with damage, which makes sense. only thing i might think about is, the fact that your "burst" items dont even come in until very late game. morde is weak early game, which you compensate well with rylais for health and power, but then you bring in FoN and sunfire, which is pure MR, armour, and health (other than sunfires AoE) which those items come in mid-game, which is where morde is most useful. my thought being, if mordes time to shine is mid game, why wouldnt you want his "burst" items to come into play mid game, being it is a burst build. just something to think about. (food for thought) but all-in-all a good build and not a lot of constructive criticism i can give other than those small things i pointed out. a vote up for me, hope you get more attention. :D

also if you feel like it, check out my morde build as a reference or something even though its an offtank build :P