Guldkoner are little statues or figurines that allow one to store the power of runes within them. They tend to be attuned to different magic types (fire, cold, death, etc) and often depict Icons or heroes who embody these types.
Guldkoner allow you to store spell with an effect related to the depicted figure. For example, a figure of Hel, two-faced goddess of Niflheim and death, would allow death-related (necrotic) effects to be stored.
You perform a ritual with the guldkoner to store the spell. It takes 10 minutes per level of the spell, without High Arcana.
Guldkoner can be triggered by
speaking the command word (3 second delay)
touching
This allows for throwing or activation on touch
Whatever spell you store within the guldkoner is treated as cast from it. Area spells detonate at the guldkoner on the appropriate number of targets nearby. Single target spells go off on the person touching. The player and the GM can negotiate other conditions that might seem reasonable.
The guldkoner is destroyed once the spell is triggered.