?
what stuff

Like I i know the arena but don't have anything to spawn in there. To get like some bosses u need matrix core witch need immortal souls but i don't know hot to get immortals and stuff like that.

Ok when u use Arena teleporter. First teleport to arena 1 have 1 ACA summon manager Have Chief and Vindicateds.
Chief Drop Immortal souls 5 soul giga wyvern rhino bigfoot mammoth
and unlock Tek Devine Armor set engrams.
Vindicateds
If u killed Vindicateds will spawn resource beetle for u can tame <passive tame cooked meat>
Arena 2
Have Kiggaroth and Endboss Broken-Devine[ manticore and Broodmother]

Also now i can't teleport away from arena. Using teleporter just teleport me two different places inside the arena.

Waas also wondering where to get required artifact for boses in SE? Like Artifact of Strong and Artifact of Massive?

You should tranfer character and play on Map Island or center and tranfer charactor back to SE.

where do u get the Chief and Vindicateds from iv killed all the bosses on the island and only got norm loot got no souls matrixes went to aca arena with summoner cant summon anything cause needs matrix ...matrix needs souls cant get souls.