As far as the trials, I did want them to be a bit tongue-in-cheek and slightly tedious, hopefully they're not too crazy, I tried to make them clearable within 3-4 minutes haha
And the void echoes are actually time-based, they start appearing after Ascension 12, once every couple of minutes. Some of the later ones are locked behind higher ascensions but all become available by and at ascension 20!