"I have in my possession the Ixcila of Aldrea-Iskillion-Falan."
"Seerow's daughter?"
"Her stored persona. Her brain wave patterns. Her memories. Her personality. Her essence."
Quafijinivon, Ax and Jake[src]

Ixcila is the stored personality and memory of a person. It can be technologically captured and preserved, even beyond that person's death. It is part of Arn biotechnology, and the Ixcila can be revived if it has a host person to live in. Known Ixcila include those of the Hork-Bajir Dak Hamee (which was destroyed by the Yeerks at some point) and of his wife, Aldrea-Iskillion-Falan. Aldrea's Ixcila was later used to help the Animorphs find a collection of weapons that had been hidden by the original Aldrea, and was hosted by Cassie while this was in progress.

Andalite technology Dome Ship | Escafil Device | Hirac delest | Mirrorwave call | Z-space transponder | Morphing | Mag-Hover Truck | Quantum Virus | Shredder | Gleet Bio-Filter | Prion Virus
Yeerk Technology Anti-morphing ray | Dracon beam | Gleet Bio-Filter | Kandrona | Kandrona Rays | Nova-class Empire Ship | Pool ship | Blade ship | Mag-Lev Train | Hunter Robot | Yeerk Pool | Bug fighter
Ketran Technology Explorer | Time Matrix | Mapping Crystal Quadrant 3 | Uninet | Adge
Other Dropshaft | Ixcila (Arn) | Pemalite crystal | Pemalite ship | Skrit Na Saucer | Hawjabran Colony Ship | Hawjabran Freighter