wisp just turned off my map drops

Didn't play a lot in wisp league, but told that wisp can make map really hard and juicy.
Today is the first time I try to get in a wisp woods and get 301 purple, 193 yellow, and 3279 blue wisps.
But through the whole map, not a single item, including gold, dropped. and also my harvest monsters didn't drop a single lifeforce while I get lucky and crop-rotation into a 10+ T3 mob farm.
Don't know if there's a hidden mechanic I don't know or just a simple bug occurred and ate up all my investment.

Oh no, it looks like I went too fast and didn't aware what I have clicked. It seems reasonable if this altar really exist, tyvm for reply.
Learn a thing everyday in PoE.