Psicrystal

As per the SRD:

• http://www.d20srd.org/srd/psionic/monsters/psicrystal.htm
• http://www.d20srd.org/srd/psionic/classes/psion.htm#psicrystals

When a Psicrystal dies, the owner can create another after:

• Waiting a minimum of 24 hours
• Performing an 8-hour psionic ritual (requires full concentration and no interruption)
• Spending 10xp for every HD of the Psicrystal

The crystal is effectively the same psicrystal entity it was before, except fully healed and without damage. As such, it will have the same personality, same memories, stats, feats, skills, as the psicrystal before it died.