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.
Location & Notes:
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.