Yunan only checked on the monsters of this 22nd floor before leaving, they were armored rhinoceros monsters that could shoot spines at the enemy and charge at them, they could also cast a sort of destructive beem from their horns after a brief charging time. Yunan did not stay long, but returned to the 20th floor and headed straight to the guild, he sent a message and some money to the orphanage his mother was in, then sold the antidote to the spider poison of the 21 floor, something that the guild were more than eager to buy after Yunan displayed its effects, the guild would be insane if they did not keep samples of all the poison in the dungeon to test out the potential antidotes.
Thanks to the hard work of Ophelia, Yunan yet again filled his account, he put half the money from the copious amounts he sold to the guild into Ophelia's account, after that he went to the guild warehouses for medicinal plants and solutions and bought all their stock, thanks to the genie, even the bad quality ones could germinate in the garden, and allow Ophelia to both experiment more without concern for the dwindling stock, the genie also was also tasked to create as big of a stock of all medicinal items it could find in the twentieth floor as possible.
To do that Yunan gave a storage ring to Drogon and told him to fly around the 20th floor and help the genie, in exchange for freshly killed monsters from the 50th floor, the ring was linked to the portable home and the genie could communicate with Drogon through it. Yunan felt Drogon was sleeping too much lately, especially after the last feeding frenzy, it seemed he was on the verge of evolving again, and needed better food in the next period of time.
After a day of rest Yunan returned to 22nd floor, he chose to do guerilla tactics, using shadow meld and invisibility as well as lucky cover, he tried to kill the armored rhinoceros monsters in one attack, using decapitation or fatal instantaneous damage to the body, but his most effective method was poison touch. He would just pass by the monsters unnoticed and prick them with the most potent paralytic poison he had and watch them fall down moments later dying from asphyxiation and heart failure.
The poison was chosen by the armor as the most suitable for Yunan, according to Ophelia, the paralytic poison would only last for 2 minutes before decomposing on its own, making sure that if the monster meat was eaten, it would not have any effect on the eater. Yunan has become very dependent on the armor recently, especially since it had its latest upgrade, Hephaestus must have done something to the old portable home, because the armor was smarter and closer to complete sentience, that when it was before.
That was by no means a bad thing, Yunan felt like he should be more in control and try not to rely on this armor, however he thought what was wrong with using the armor to its fullest potential, it was bound to him and the chances he loses it are extremely small so what is the point of trying too hard when he had a way to get stronger without losing too much life span in too much struggle.
With that idea in mind, Yunan returned to using the buffs of the armor, he started with 100% and kept increasing 10% every few days when he got used to the power difference with the help of the honey, the monster meat that was treated by the genie, the lotus fruits, the lava wine and the cleansing pool. Yunan could adapt to 180% by the time he had finished mapping the floor.
The boss of the floor was a bipedal rhinoceros with four arms and full body armor, it had two arms for casting spells and two arms for using two gigantic clubs that looked like stalactites torn from the ceiling of the floor.
Yunan was almost crushed by its first charge, it was agile beyond its weight class, this hulking monstrosity at the height of 8 meters and the weight of a few tons, could move almost at the same base speed as Yunan. The boss also had high attack speed and very impressive striking strength, each club that missed Yunan would stir the winds and leave a crater in the ground. Yunan decided to make use of the boss to train his agility and blocking, it had been a long time since he last used a shield against any foe.
The battle went on without winner, the force of the rhinoceros boss was enough to ground Yunan to mince meat with the slightest mistake, and the dual wielding and high attack speed made Yunan feel like he was in a blender, therefore Yunan used his shield to parry more than fully block the attacks of the boss. Yunan has been hovering just under mastery for all the combat skills he had, and thanks to this fight he got the insight to get full mastery over all weapons, Yunan did not defend much using weapons, mostly dodging the attacks or using the armor to block them, however the new insight in defence helped Yunan formulate a new understanding of attacking with weapons and defending without need to dodge as much or take as many hits with the armor.
After achieving mastery at the shield, Yunan started to change weapons to try his new found insights, although it was harder in practice, he could still keep up with the boss. Next came the last part of the fight, how to kill this fully armored hill, the armor joints left some space for Yunan to work with, also the possibility to use paralysis poison, but Yunan opted to use spells instead, he had been leaning on weapons too much, and so the spells of choice were lighting bolts, ice field, mud mire and finally earth spike. Yunan chose to go for versatile spells to try different strategies, and exercise his wisdom for a little bit, after all he was coming on his 17th birthday, even if he had a good brain on his shoulders, he should exercise it, before it turned to mush like his mother told him before.