Did you know nr. 31 – Crystal Generation special ability

Crystal Generation special ability produces 3 crystals at the beginning of each week if the player has at least one crystal dragon in any of his armies. The effect is not cumulative.
Heroes 3.5: In the Wake of Gods Portal
Preserving Heroes of Might and Magic mods since 2012
Crystal Generation special ability produces 3 crystals at the beginning of each week if the player has at least one crystal dragon in any of his armies. The effect is not cumulative.