I also just saw these notes:

Wild Mushroom now becomes visible after 6 sec, up from 4 sec. Base damage increased by 400% (from 269-304 to 1300-1573 damage)
I think they meant [in]visible after 6 seconds. Still, with 5 boomkins dropping these, that's 5x3x1400ish = ~21,000 damage to trigger remotely. Not bad.

Argh!