A True Test of Will

A True Test of Will is the thirteenth quest in the Legends of Old questline, and the fourth in the X-15 segment.
START: Sera, located outside of Death'kul
END: Tylious Dawnbane, located inside of Death'kul
==Description==
Sera pats you on the back and gives you a note, smiling.
"Go now name, I know not what awaits you inside of Deaht'kul, but I know that it cannot be pleasant. I wish you the best of luck inside of this god forsaken house. I'll tell you one more thing; the library you look for is near the top of the house. That's all I can tell you."
==Objectives==
*Defeat Onoronodonovon
*Defeat EDK-000
*Defeat Vexiora
*Obtain the "Sigil Compendium" from the ruined library
*Defeat Clastrum
==Progression==
This place gives you the creeps. You can't help but constantly look over your shoulder, constantly fearing a new type of fear to await you.
==Completion==
Tylious looks at you.
"You did alright back there <name>, you managed to not die and get your book. Well done. Yet, we have yet to find a way to open that book. Perhaps the way to open it lay past these doors. Steel yourself <name>, who knows what awaits us passed here."