Angelo had a skill called Sacred Sacrifice, and the effect of this skill was very simple.
Based on the price he was willing to pay he received a proportional power boost.
For example, if Angelo sacrificed his sense of touch for 1 day what he received was a power boost of x2 or he could simply put it all into a single attack to make the next skill 10 times more powerful.
However, being a level 165 soul evolver was still not enough for him if he wanted to face a dragon that surpassed him not only in terms of race but also in terms of Order and level.
Therefore, Angelo had no choice but to pay one of the highest prices he could in exchange for power.
He sacrificed his sense of sight for 7 days in exchange for his power to be multiplied x10 for 1 full day or he could consume all that power in a single attack to make his next skill 100 times more powerful.