Most, but not all, panthara require a trick to tame. Farm up some Fresh Talbuk Meat which is drops rarely from talbuks on Argus; approach your target; throw a Freezing Trap; Feign Death to lose aggro (this is essential for the meat to work); throw the meat directly on top of the panthara; tame quickly! Panthara that do not require this trick are Naroua, Sabuul, and the Shadow Stalkers in The Seat of the Triumvirate dungeon.
Located in Mac'Aree. He spawns by the southern corner of Seat of the Triumvirate. Sabuul can be tamed without the use of Fresh Talbuk Meat. Unlike Naroua he retains a purple fog and a subtle void aura after taming. The wavering aura can be faint in the light, but is more obvious in the dark.