Talked about that yesterday in the Ogar-chat. BKB totally blocks (obviously) all forms of pure damage. What comes into mind would be Chens Test of Faith, Butchers Meat Hook, Enchs Impetus, Tinkers Laser and ODs Arcane Orb.

From my point of view to a certain extent this is a question of name-giving. BKB makes you immune to magical damage, so I don´t get why it should render you immune to pure damage. A way more interesting question would be, whether changing it could make pure damage imbalanced. It sure would not regarding skills that do a certain amount of damage which have a maximum, like Laser, Test of Faith or Meat Hook. They won´t scale that good in late game and therefore get weaker the longer the game gets. Still, it´s different with Impetus (to a certain extent) and above all with Arcane Orb.

So, first question is, should pure damage go through BKB in your opinion, and second is, would that make OD overpowered?

Regarding the latter question, I don´t think so. It sure would change the hero, because of the massive amount of damage he would still capable of doing all the time in the late game. So, he maybe could be, besides QoP, one of the few INT-heros who are actually able to carry a game. In opposite to QoP though, besides of his ult he still would be a single target hero without escape mechanism and a squishy one in addition.

Opinions?

It would be good to see OD being picked up a bit more, but he;s still really squishy, has no escape so I'm not sure if this would make him much better. It might be useful to bloodseeker as well since his ulti is pure damage. On a sidenote, does that mean BKB blocks desolate & dispersion right now? Since I assumed BKB only blocked targeted spells.

It does block Spectres pure damage, yes.

Pure damage is a form of magical damage (ignores armor) that is not reduced by magical resistance. I think the mechanics of BKB and Pure damage are fine, so I wouldn't change either of them.

OD is the epitome of a glass canon, and I think its fine to leave him as is as well. The current dota trends don't particularly favor glass canons unless you are highly skilled and know how to both farm and avoid getting killed, but that could be subject to change as strategies flow.