DOTA 2

Blade Mail works well until he gets a BKB. It reflects pure dmg. Mostly the issue is if you can't counterpick him due to last pick, you're gonna get fucked in the ass if he's not retarded in his item choices. People like to rush that agh but tbh a BKB will do a lot more against certain setups, because while you don't give a fuck about magic dmg, disables and pure dmg are a real problem.

Pure damage by definition is not affected by magic resist, otherwise it'd be magic damage. Blood Seeker dmg is health loss, it's even more powerful than pure because it basically cannot be stopped by anything, including magic immunity. Used to be pure until last patch, it's not the strongest spell in the game in terms of properties, since it cannot be removed nor ignored, which is a nice buff.

Read this article on the wiki, not sure if it's up to date or accurate as it's still a wiki but it should help understand damage types:
http://www.dota2wiki.com/wiki/Damage_types

The tip on the side about dmg being reduced means damage reflected is calculated after reductions. Say you cast a spell for 100dmg. It won't reflect 100dmg, it will reflect 75dmg, which is what you take because of the innate 25% magic resist. Basically it returns what you take, not what the enemy does. The enemy will take 100% of what is returned though regardless of his resist, so in this case 75. If it was affected by magic resist he'd take 56.25dmg.

Well she's MORE annoying, but yeah don't like the hero. New ult is pretty solid though, might see some play whenever she makes it to -cm, maybe, probably not. Thing is she's still more or less worthless until she has many items. The thing is there's so many viable carries nowadays, why pick her. Hell if you want a lategame, there's still PL or Spectre which will still tend to outcarry her even in super lategame anyway, and they're both surprisingly a fuckton more useful early on if you build them correctly(basically if you don't rush radiance and pick desolate on spectre).

My big issue with necrolyte, in a competitive point of view, is you need a solo lane, and he's not an exceptional solo. He's ok kinda but the current solo heroes tend to crush the fuck out of him in lane. You might be able to dual lane him say mid with Lich(undead dual lane yo) to compensate. Assuming you lane well and you farm decently, he's a great fucking hero, but that's a major issue that tends to keep a lot of heroes from the competitive pool, if they can't be laned properly. As for items, definitely go for tanky shit. Radiance, while a common pubstomp pick on him, I find is awful. If you have shit tons of money, rush a hex. But mostly get cheap tanky items, I like mek+drums+phase/treads(matter of choice, both are very valid choices, hell arcane works too) into a sheep/shiva. Necro's goal is to stand in the middle of the enemy team spamming heals+nukes and not dying, if you die your contribution is extremely reduced. Another much better pubstomp build is bloodstone+boots of travel, you can farm a ton with BoT by aoeing the waves and bloodstone will give you the regen to deathpulse almost non stop as well as a lot of health and mana. Do the usual bloodstone build where you get arcane first, then buy the rest of the bloodstone, disassemble arcane into bloodstone then buy BoT.

Anyway he's a cool pick but I don't find him reliable enough to be worth a competitive pick other than pocket strats. The only way I see him winning lanes is if the drafter reads the lanes well and see there's no agressive trilane to contest(so he puts like 2 supports that can jungle/pull and let necro freefarm vs a solo lane like darkseer which is doable if you pool the necro so he has good int) or if you put him dual mid. In standard trilanes he tends to not get enough xp and can't really last hit for shit and in a 1vs1 he'll die to darkseer, sylla, bat etc. Especially sylla will crush the fuck out of him super hard once 5, one entangle and you're basically dead as fuck. If you lose your lane with necro, while he's an ok flash farmer, he still requires a lot of levels and gold to be remotely efficient. If he has to switch to a "support" role, he's pretty fucking awful, his ulti isn't good until 11 and really good at 16, his heal puts him into shitty positions if he can't take the heat and that's all he does. In pubs whatever works anyway.

Edit: Oh also forgot, Necro is one of the hardest lategame carry in the game. He's a fucking beast with full items, very very tanky, can drop the enemy carry from like 60% hp regardless of his items(other than bkb but with 4secs bkb now...), you definitely don't want to go super late vs a necro.