In dota, spiderling (the big spider) has 2 ability, poison sting and spawn spiderite.

The ability spawn spiderite is supposed to be a toggled spell, which start in auto-cast when spiderling spawn, and we are supposed to be able to toggle it off, if we don't want that the spiderling spawn some spiderite when last hitting.
But in dota2, it's just a passiv ability

It's especially relevant, considering the huge amount of gold and xp spiderite are giving, while having only 175 hp.

I also guess that you could "orb" walk in dota using that ability like an orb. but anyway that part is minor as we still have bugged aggro with summoned unit (and if i'm not mistaken with all creep)