TERA Battle Arena

TERA Battle Arena was a MOBA (Wikipedia: MOBA) from Bluehole/Krafton launched in Korea in September 2020. It was added to EU/NA in patch v99 October 2020. And was closed in v102 January 2021.

This Reddit post tells all you need to know: https://www.reddit.com/r/TeraOnline/comments/jnnh4n/tera_battle_arena_dead_on_arrival/

Battle Arena was accessed from TERA client from title screen, after server selection screen. Game mode is a 3-person team battleground, featuring 18 different Champions from TERA. You are not using your own character, but different heroes from TERA. 30-minute match takes place in a single map. Each player selects a hero and joins a one of four three-player teams to fight other teams. Each team gathers as many coins as possible during the match.

It's basically TERA PVP combat (which actually is good) but each Champion has like five to six skills unlike classes they're based on. And you can't rebind your keys to play it like TERA character you're used to. It has near zero options you can adjust, and it also fucks up your settings in actual game (like UI scaling).

Setting and various stuff
TBA is not open-world game, but has lobby where you wait matches. Lobby is basically a big round room with some props and characters scattered around.

At the start you meed Anya (or isekai copy of her) who explains: "This place is called Oscinium Agaia."

"It connects different planes of existence that would never have crosses paths if it weren't for dimensional instability."

"You'll see many more lookalikes of people from your world, just like me."

"Oscinium Agaia" means something like Agaia of the Songbirds. (Agaia is a place in TERA lore that Manahan created and where he was locked into, dunno if these places are related.)

Lobby has various characters from TERA, including dead ones like Kaidun with Fraya, Randun or Sharla, whose lifeless body is found in Khanovar Front. There's also Popori boyband called Popori Sonyeondan (PPS) (parody of Korean BTS aka Bangtan Sonyeondan). Characters don't really do anything or say anything useful.

There are some props you can practice your skills on and some objects explaining game mechanics, like buff stones, springboards and a train that carries gold coins.

Quests
TBA has few quests. Two quests are about saving some characters of TERA before they are killed. (Paesyn and Zolyn from Dakuryon's Sanctum and Elleon in Black Core Engine Room.) After quests are finished two copies of these characters appear in lobby, which is bit confusing.

The most interesting part lore-wise are two original quests. You'll meet god Lok in the Sealed Area (accordingly TERA lore Lok took gods' powers and locked them in unknown place before he was killed.) Lok is not really evil or demonic as he is reviled in TERA, but guides player in these guests. You'll see a "mysterious woman" giving God of Death Thulsa back his body.

On the second quest in the Forest of the Fallen "Thulsa stole titanic essence from the Tower of Shara" and is again working with this woman, who takes the Crystal, leaving you to fight Thulsa.

It's not entirely sure who this mysterious woman is. Some on forums think she is Shandra, but she doesn't look like Shandra Manaya at all. Manahan herself? We are pretty sure Manahan is a boy and not a girl. (On teleporter to Sealed Area it is called "Manahan Seal Site", also woman is working "for my lord"). One possibility could be Zuras, who is the creator of Devas and would look like one of her children.