I won't be talking about what happened for the rest of the dungeon run. After all, everything is just the same as before. I ended up using the [Corpse Bomb] as a way to get rid of all the zombies I have and to also get rid of the final boss too. I managed to replenish my zombies after the first boss was killed and repeated the process until I go all out on the final boss which allowed me to clear the dungeon using the Necromancer class.
When I got out of the dungeon, everyone was stunned to see me out of the dungeon. I have seen some of them who are still there even after I got out of the dungeon so they know that I entered the dungeon in Abyss Difficulty which is why they are stunned to see me go out without a scathe. The others who didn't know about my entry are shocked as I went out from the dungeon's entrance the color that indicates the difficulty of the dungeon is red which signifies the Abyss Mode.