I found the Symbol of Time of time in a cemetery, and it was immune to all damage, so I got wise, I thought, let me use Assur's Bane:
"The Torajan Cemetery is a mostly-empty area that connects the Torajan Jungles with Teganze. Its only inhabitant is the Symbol of Time, a harmless 'monster' whose immunity to all damage can only be removed by Edyrems provided by the Crystalline Flame Medallion, and whose destruction will open a portal to the past to the uberlevel Toraja."
https://median-xl.fandom.com/wiki/Torajan_Cemetery
After over HALF AND HOUR using Assur's Bane, I killed the Symbol of Time, so it is possible to kill the Symbol of Time without Edyrems.
Is there a Median XL award for dumbest player?
Assur's Bane
Item Level: 99
Required Level: 100
+1 to All Skills
Adds 7-13 Damage
+30% Damage to Undead
+1 to Purify
Increase Maximum Life and Mana 10%
+2 to Light Radius