Tor Lara - Monster Den norhtwest of
Rogne on
Ard Skellig , but the spawn rate i think very low, i try 40 times when it spawns. And NO collect items from treasure if it is not there, i think not spawn again, only once in a game. Load back save game, do it again, till it is there...
Tor Zireael - Very - very difficult to take, it is in a bandit camp treasure in Skellige - town name is Rannvaig, there is a lake near the town, and a bandit camp, with only lvl 15 bandits, but i try many - many times, and load back savegame to get this sword, and it spawns there in treasure,
All two is relic, thats why you can reach so high level, more better, than a witcher sword.
And i think min level is 47+ ... to spawn it