"I saw you IO Tontruk on Vycinyth in the second phase. They used to say nobody could beat an Esoomian."
Bren Derlin, to Lobar Aybock[src]

Tontruk was an Esoomian shockboxer. Some time between 3 ABY and 6 ABY, Calian shockboxer Lobar Aybock defeated Tontruk during the second phase of a bout on the planet Vycinyth. Tontruk's armor became ionized when the shield dropped on the armor's hub, and Aybock landed a hit with an ion-charged shockmitt, resulting in an ion-out (IO).