As long as one's realm met the requirement of being below a War Venerate, they could enter this ancient ruin as many times as they wished without restriction.
Because one could gain various benefits within the ruins while also facing numerous dangers, those who survived often improved their strength to varying degrees. Long ago, some older War Kings had relied on this ruin to continuously build their foundation, ultimately surging to the rank of War Venerate in one fell swoop.
However, for these older War Kings to achieve a breakthrough, the opportunities consumed far exceeded those required by younger people. Consequently, a new rule was later introduced, limiting the entrance to martial artists under the age of 50.