Is there a way to make the spell magic tattoo (Spell Compendium 55) last forever? The feat Extend Spell only makes it last 48 hours.
I only need the magic tattoo for myself. I can't cast the spell, but I can pay to have another cast it on me.
The spell Permanency, from Player's Handbook makes a few selected spells permanent, however there is also a suggestion that other spells could also be made permanent, if Game Master would allow it.
The DM may allow other selected spells to be made permanent. Researching this possible application of a spell costs as much time and money as independently researching the selected spell (see the Dungeon Master’s Guide for details). If the DM has already determined that the application is not possible, the research automatically fails. Note that you never learn what is possible except by the success or failure of your research.