Follow the map below to collect all items.
IMPORTANT: There are 3 chests that have monsters. You won't be able to defeat them at your current level though because they are just too strong. If you follow this guide, you should have 4 Hourglass. So at the start of the battles, immediately use one Hourglass to freeze the monsters, then you free hit until they die.
Bestiary Checklist:

Chests/Items:
- C-099: Hi-Potion - 1F, right room.
- C-100: Unicorn Horn - Throne Room -> 2F, left room, top chest.
- C-101: Alarm Clock - Throne Room -> 2F, left room, bottom chest.
- C-102: Gold Needle - Throne Room -> 2F, right room, top chest.
- C-103: Maiden's Kiss - Throne Room -> 2F, right room, bottom chest.
- C-104: Cottage - Throne Room -> 2F, right room, bottom-left chest.
- C-105: Sleep Blade (Monster) - West Tower 1F, right chest.
Monster: Skuldier x4, Steel Golem - immediately use Hourglass. Tellah casts Firaga and selects all targets to kill all Skuldier in one turn. - C-106: Mute Arrow - West Tower 2F, left chest.
- C-107: 10000 gil - West Tower 2F, right chest.
- I-028: Bacchus's Cider - West Tower 2F, top pot.
- C-108: Bomb Core - West Tower 1F, left chest.
- C-109: Coeurl Whisker - East Tower 1F, left chest.
- I-029: Hermes Shoes - East Tower 2F, left pot.
- C-110: Emergency Exit - East Tower 2F, left alcove, top chest.
- C-111: Hi-Potion - East Tower 2F, left alcove, bottom chest.
- C-112: Blood Lane (Monster) - East Tower 2F, right alcove, top chest.
Monster: Coeurl x2, Lamia - immediately use Hourglass - C-113: Hi-Potion - East Tower 2F, right alcove, bottom chest.
- C-114: Silver Hourglass - East Tower 1F, right chest.
- C-115: Ether - Underground Passage, left alcove, left chest.
- C-116: Ether - Underground Passage, left alcove, right chest.
- C-117: Silver Apple (Monster) - Underground Passage, right alcove chest.
Monster: Mad Orge (x3) - immediately use Hourglass then attack until you win.