You can get random 5 new chess every turn, the level of them depend on your courier level. Level 1 cost 1 gold, level 2 cost 2 gold etc.. You can refund your hero, and system will return the same gold as its level.

Here we can store 8 hero in the area of bench.

we can only put the same quantities hero as the courier’s level. If your hero on the board is more than your courier’s level, the lowest level will be put back to the area of waiting. If your area of waiting is full, the lowest chess/hero will be refunded.