Reaching Academy Lv. 25 is a landmark in your progress towards tier 4 troops in lords mobile. To upgrade your academy from level 24 to level 25, there is a requirement to upgrade three important buildings, altar, prison and battle hall to level 25. These buildings require special materials soul crystal, wartome and steel cuffs, these materials can be purchased from the gems only. This tools help you calculate the number of gems you need to upgrade these buildings. Just enter your current level of the buildings and number of materials you already have, and get the exact amount of gems you are short of.