Armor has no effect on skills, whether it be Regulus' mines or TB's fireball.

Stacking health or armor really depends on who you are up against. TB depends mostly on his skills for damage, which would not be resisted by armor, so stacking health would be better. UB, however, often depends on his auto-attack, so stacking some armor couldn't hurt. Overall, however, I usually stack health rather than armor, since most of the damage you'll be taking will come from skills. But that's just me.

thanks for the indepth answers

my suspicions were confirmed.

Personally, I always buy Nimoth Chest Armor AND Hauberk of Life, since 750 armor, 1100 health, and +10 health per second for only 3250 gold is too good a deal to pass up. I usually end up:

Gauntlets of Brutality

Vlemish Facegaurd

Plenor Battlecrown

Nimoth Chest Armor

Hauberk of Life

and then buy a Heart of Life and citadel upgrades. Oh, and TP scrolls and locks, of course.

this old nugget again. armor does not lose effectiveness. what you're seeing is the number "% mitigation" appears to grow at a decreasing rate as armor increases. this is because the armor formula is % mit = 100 x (1 - (2500 / (2500 + Armor)))

but that quantity is deceptive and not what you really care about. increases in armor are compounded on existing mitigation so the gain is linear if what you measure is Time To Live, which is a much more reasonable thing to care about. its not really about how much less damage you're taking its about how much longer you're living.

for example:

if your mitigation is at 80% and you're taking 100 DPS you're only going to lose 20 health per second. if you increase that mitigation from 80% to 90% you won't be losing 20 health per second, now you're only losing 10 health per second. you only increased your mitigation level by +10% but your time to live just doubled!

so yea, math and stuff, blah blah blah. 

conclusion: armor provides linear constant increases in Time To Live at all levels of armor. don't pay attention to the apparently diminishing rate of increase of the quantity %mitigation. its not telling you anything useful. 

armor is good, here is my experience

i played a 1v1, started at lvl 20, had 20k gold each

i was reg, the other player was UB

ofc being a stupid noob i got ashkandor right off the bat.

the UB got all armor items.

i do no damage to him what-so-ever and got owned.

i learn my lesson and left.

Didn't know that, i thought the EVERYONE's ablities are considered as armour ignoring dmg (magic dmg). So Rook's towers do physical dmg. Any other demigods abilities that do physical dmg instead of magic dmg?

Imo, this a major fault of the game, not telling you what abilities are ignoring armour and what not...How can a new player (noob) know this? He gets his ass kicked, he doesn't know why and then he rage quits. Not good, imo...This should be corrected.

games are complicated systems with rules. a good gamer knows this and knows that to master the game he must acquire a deep understanding of the rules. coming to the web (this here forum here) and asking questions is the best way to learn. a clutter of in game documentation would just make the game ugly and overwhelming. the community and the players are responsible for the education of noobs. they can learn this stuff the same way we did (examining LUA files, careful observation, controlled testing, etc.) or they can just ask people who know. 

The Rook towers code wise are exactly the same as the "normal" towers, just with some added timing code for "decaying".

Yes you can.

teseer u can't i tried a few secs ago

hmm wingd doesn't by pass armor  it is more like a passivebuff  with a slow drain on mana  it increases the dmg so if ur armor is the same as the ammount it increases it would seem it does

Angelic Fury is a bonus to normal attack, it is mitigated by armor. 

Rook's Towers do not count as minions. they don't benefit from minion upgrading gear and they can't be controlled. they're like map towers (although they do not benefit from the Citadel upgrades that affect map towers). 

so s1foo was right on both of those counts, despite not actually using a single complete sentence or punctuation mark, he knows whats up.

Rook's Shoulder turrets are equivalent to the type of damage dealt by a map tower (arrow towers, tower of light, trebuchet towers) and they are mitigated by armor. 

@ DeadGhost,

looking the LUA files is only way to discover this stuff. you can always just test it in game. check the tooltips, check healthbars and stuff, use your gut, whatever. LUA files are just a bit more reliable is all, since its the raw data and isn't going to be affected by stuff going on in game that you might not be aware of. 

and for the record, Compost gives a much lower bonus to Shamblers than Entourage. 

transitive you spelt my name wrong  there is a i  in my name s i 1foo