Life in the dungeon passed by slowly and steadily for 5 years, it got to the point of Yunan starting to crave for something to go wrong and the latest episode of legacy hunting was the trigger Yunan needed to go on his own for a bit, he had to collect the legacy anyways so why not now.
With that idea in my mind Yunan left his current party and decided to go to the outside world in search of the legacy of the Phoenix, even shards were acceptable for Yunan. Point of order: what Tartarus mentioned about Yunan gaining a shard of legacy did not mean that there was only one single phoenix legacy as a whole, what it meant was that a piece of legacy was claimed, and Yunan was not bound to find the parts related to the same phoenix that Yunan absorbed, all he needed was enough of bloodline to fuse with, nothing more, this talon was named shard because it was a fragment and Tartarus thought it was a good melodramatic twist to use shard instead of part.
In short, Yunan had to accumulate enough phoenix fragments to complete the bloodline, it depends on luck how much Yunan is able to get each time, this time it was 5 per cent next time he might just find a full phoenix and be done with the quest. Thus Yunan chose the surface world because he thought there might be a higher probability of finding a graveyard or even a nest or an egg in the outside world, even if he knew that he could gain his legacy eventually in the dungeon, what was the fun in certainty?
Yunan had 90 years left on the counter, at worst he would need to spend 50 years to reach the 90th floor and by then all he would need was a thought to find the legacy if it wasn't provided by the dungeon, so he has 40 odd years to spend trying his luck here and there, and it would also count as travelling the world.
When Yunan forcefully brought the whole family for a meeting, they were visibly upset at first, it was not like Yunan to force himself on others, or even force others in any way, so when Yunan told them about his decision to leave the dungeon temporarily for a couple dozen years shocked faces filled the room, Hephaestus was first to laugh at the sudden decision while Luna was getting worried about Yunan, Debauchery had a constipated look on their faces because they were pulled out from their best attempt at a certain boss for just this, while the girls were making mental notes about what kinds of clothing they should bring with them in this sortee.
Hephaestus was laughing because he knew that he was part of the reason Yunan made this decision, when Yunan asked about the legacy shards Hephaestus just said "keep climbing and you will get it" effectively given a guarantee that Yunan had a safe back up plan, he -Hephaestus- also choose to do the same as Luna and not tell Yunan about where to find more shards because bringing back that guy earlier than was just no good.
Luna was getting worried because Yunan had robbed a number of gods of their hard-earned divinity, even if all he took was a grain from a desert, it was a grain they worked hard for, therefore there were many gods that wanted to either claim his collection of divinity to punish him for taking what they worked hard for, she thought hard about what to do and only when the party was over did she stop fretting over it, Yunan told her that he had his own ways to run away or avoid danger and since gods could use their piece of divinity to find him, he could sense them the same way.
Debauchery were irreconcilable due to having their best run interrupted, but all was forgiven when Yunan offered to craft a lucky talisman for them that has the same effect as the lucky ritual, while Anne needed the persuasion of a few tons of rare herbs to experiment on, the garden had been flooded in man for over 10 years and there was an abundance of such materials, mostly thanks to Ophelia not having the time to practice pharmacy and still go adventuring with the harem party as dubbed by Balin, thus the accumulation of the rarest herbs in the planet got bigger and bigger, if not for the fact that only stalks of these herbs get sold individually every now and then they would have been sold to the guild.
Becoming a supplier for the when it came to rare herbs would bring so many riches on him that there is nothing to describe that amount other than the combination "untold riches", add in the fact the he is already the supplier for rare metals and rare enchantments and the guild might start getting greedy, even if Martin was not dumb enough to try anything, his counsel might be, after all, that much money would tickle the greed in any person.
Being too eye-catching already was not a reason to go supernova and glitter everyone into blindness, besides, if for example, one says that someone being able to provide refined metals is doable using mana and some complicated spell work, then the same can be said for enchanted pearls, however of the same person does both,it means he has a treasure in his hands to allow him such a miracle, however, if you add in rare herbs into the equation, the treasure becomes something that even gods want to get their hands on, therefore Yunan opted to keep that fact a family secret.
As for the girls they were disappointed to learn that they would not be going with Yunan and only see him when he returned home, Yunan wanted them to reach the 50th floor faster during his travels so that he might bring them out with him and upon return they could start their party from the 50 floors and start heading to the second half of the dungeon.