Academy - Special buildings | Academy - Buildings Heroes VII Guide

Sacrifice only the items which you will not use in the Artifact Recycler.

While developing the Academy cities, you can buy two special buildings which will unlock additional options for you. First one is Artifact Recycler which, as the name suggests, allows you to sell the artifacts you have gathered. In addition to gold, you will also receive resources. The number of received resources depends mostly on the value of the sacrificed item. Remember to sell only the artifacts that none of your heroes find useful.

Before buying scrolls, develop your Mage Guild to level 4. It is possible that you will receive the spell you're interested in for free.

The second building that gives you new options is the Inscriber. This building allows you to buy new spells for your hero. They usually cost from 3 to 8 thousands of gold and are random generated. Remember that the spell you buy can be assigned only to a single hero.