One leaf for half a bottle of Royal Sap.

The other students' eyes widened at the price. It wasn't cheap.

One Royal Sap was 5,000 school points. Half a bottle was 2,500 points!

Not everyone could bulldoze purification towers like Jiang Qing'e's group. Most teams might aim to just take one tower down.

According to past calculations, most squads left the Umbra Cave with about 5,000 points.

2,500 school points was no small price to pay.

But, but, but. If the trade-off was the opportunity to cultivate in the onyx lake, it might just be worth it.

After all, school points were traded for cultivation resources... the onyx lake was...