Timeline: new age of prophecy's era
First proposed by then emberpaw of thunderclan after news that Galestar of windclan had forced a Kittypet to cross into riverclan territory, almost causing them to drown as a "test of willingness". they bought up one of the oldest tales of firestar, how when he was a kittypet he had to prove his worth to thunderclan by fighting a warrior long enough to make them bleed. "At least give them the taste of a honorable warriors life before you corrupt them to become codebreaking cowards like you and windclan!" hissed emderpaw, inciting the fury of windclan. Before anything drastic was done the clouds quickly covered the moon, but in the last rays of moonlight emberpaw's tail seemed to glow like that of fire causing thunderclan to change how they welcome outsiders, followed by the other clans in the following moons. (Though windclan would be several seasons late to adopt as thunder/windclan relations were at a all time low during galestars reign.)
Here are the trials:
testing