A Grave Situation
Resurrect, then look for the gravestone that Gaeriyan told you to find.
Linken's Tempered SwordDescription
If you return to the graveyard, <name>, you will find a gravestone there... Not just any gravestone; this one will stand out from the others. Secrets lie within it.
Push on the stone, and you will learn of these secrets...
Progress
This must be the gravestone that Gaeriyan mentioned...
Completion
You push on the stone firmly, and it slides away, revealing a small depression underneath it.
Placing Linken's Sword into the depression, you realize that it fits perfectly...