Sergeant Knox in Dread Ring provides quests to Dread Spire, Phantasmal Fortress and Death Forge. These quests are supposed to provide specific results on certain days of the week (Greater Marks of Stability, Union and Power) depending of the place you enter. The coresponding description for each place seems to be completely off compared to the actual result, with Greater Marks of Union being the rarest of all. Maybe you can take a look at that?
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On Saturday and Sunday, for whatever reason, entering by the quest gives a random mark. However, using a lair key (bought with Vanguard Scrip) will still yield the correct mark.
However, the quality if the mark is always random, Green, Blue or Purple. Doing a lair outside the specified day will never yield a mark regardless of means of entry.
Note however that these distinctions will be erased in Mod 12.5 as all of the current marks will become a single type, renamed Enchanting Stones. At this point, doing lairs on T, W, Th, Sa, Su will all have the same items though the range in quality will be unchanged.
Exactly, results seem to be random on specified days (although I get enough purple quality). Problem is that Union seem to be more rare than the others (although this can be purery due to poor RNG).