These are the locations at or near where i killed the rare spawns. both Pixxt spawn in the arena with Gladiator and Warlord, from the side i have them listed on. The spawn time is roughly 15 minutes for BOTH sides, so it can be both spawns in 5 minutes, then 10 for the next. Each has several place holders. Viqu seems to spawn in ANY location outside of a building and the arena, and Dedgerex I found all over the inside of the arena, in non named or golem spawn points.
P 137.7434, 33.0222, 5.0020, 127, 64, 0, 3, Chef_Vuzcv_(hunter)
P 90.6853, 20.2778, 1.5614, 127, 64, 0, 3, Night_Watchman_Fxi_(hunter,_roam)
P 404.9262, 183.4383, 5.0020, 127, 64, 0, 3, Animal_Handler_Yluxx_(hunter)
P 264.5009, 470.7087, 1.9822, 127, 64, 0, 2, Ra`Tuk_Hrux_Vekxit_(hunter)
P 627.9321, 347.1441, 2.6500, 127, 64, 0, 2, Ra`Tuk_Hrux_Vekxit_(hunter)
P 586.1910, 439.4069, 0.0020, 127, 64, 0, 3, Viqu_the_Blindeye_(hunter,_roam)
P 629.5973, -539.1002, -39.9980, 127, 64, 0, 3, Reluctant_Gladiator_(hunter)
P -6.7384, -539.3571, 0.0020, 127, 64, 0, 3, Pixxt_Hihkx_(hunter)
P -280.3154, -540.1948, -39.9980, 127, 64, 0, 3, Warlord_Vokken
P 162.6330, -863.8265, 0.0020, 127, 64, 0, 3, Dedgerex_(hunter,_multiple_spawns)
P 280.0856, -534.8331, 0.0020, 127, 64, 0, 3, Pixxt_Kihkx_(hunter)