IMO looking at just how easy it is to get a BKB quickly in current DOTA because of the deluge of gold on the map and how basically every role gets it first or second item, the item needs a mega nerf and/or complete rework.
The biggest way, I think, is changing the items used to build it. Replace Ogre Axe & Mithril Hammer with Reaver and Demon Edge. It turns BKB into a late-game item on the level of a Satanic or Abyssal Blade. Now I understand that means that it makes magic users SUPER great, borderline OP. So it would require a pretty extensive reworking of the fundamentals of Dotes or perhaps a smaller Minotaur Horn-eque magic immunity item could be bought for use in the interim.
I'm no expert so maybe what I am saying is absolute gutter trash, but SOMETHING has to be done with this BKB meta.
Anyone else got any suggestions? Does the item actually not need a nerf but the economy of DOTA needs a shake-up so there is less gold on the map? Or does it just need a minor tweak with how long the spell immunity lasts?
Source: https://www.reddit.com/r/DotA2/comments/urwmso/bkb_needs_a_big_ol_nerf_next_patch/