Please refer to this video for visual help: Illusionist - Level 45 Quest.
To start Illusionist's Level 45 Quest, speak with Sleyin in Silveria. (You must have completed Illusionist's Level 15 and Level 30 Quests.)
She will give you Sleyin's Third Letter and Sleyin's Pouch and asks you to investigate the White Ants. Inside the Pouch are two items - Teleport Scroll: Windawood and Green Crystal of Time (3).
Use the Teleport Scroll to arrive in Windawood and head north toward the Ant Caves in the Desert. Look for Dead White Ant Remains on the 1st, 2nd, and 3rd floors inside the Ant Caves. Click on the Remains and select to use the Green Crystal of Time on them. You will receive a Memory Fragment on each floor.
With the three Memory Fragments in hand, return to Sleyin in Silveria.
She will give you Sleyin's Fourth Letter and Sleyin's Pouch and asks you to investigate the White Ants further. Inside the Pouch are two items - Teleport Scroll: Werldern and Blue Crystal of Time (3).
Use the Teleport Scroll to arrive in Werldern and head toward Fire Valley. Look for the clues regarding the White Ants. Click on the clues and select use Blue Crystal of Time on them. You will receive Thought Fragments from them.
Collect the three Thought Fragments and return to Sleyin in Silveria.
Sleyin will tell you to look closer at the Fragments. Double-click on the First Thought Fragment and use it on the Second Thought Fragment in order to obtain Unfinished Crystal Bead of Time.
Then double-click on the Bead and use it on the Third Thought Fragment to obtain Crystal Bead of Time.
Return to Fire Valley and double-click on the Crystal Bead of Time.
This will create a Cracked Time. Destroy it to obtain a Thought Piece of Time.
Return to Sleyin in Silveria with the Thought Piece of Time and she will reward you with the Cloak of Illusionist.
Illusionist Level 45 Quest completed!
- Cloak of Illusionist (-1ac, safe to 6, +20 MP, +4 MP regen, Made of Cloth, Weight 10, Illusionist only.)