Vortex Gaming

Originally, the Challengers (formerly Burning) server didn't allow Link, Union, or Collection content.

With the recent Link revamp, Link transfer is impossible, but Link Skill levels have been changed to passives.

I'm currently leveling Wind Archer and Night Walker, so the Link is showing as level 4.

If you're planning to level up on the next Challengers server,

Adventurer Magician Level 6,Adventurer Thief Level 6, Adventurer Archer Level 6

Cygnus Knight 10

And

"Resistance 8" seems achievable

You can level up sub-characters as needed to gain a lot of benefits from Link.

Summary: Link cumulative level is now passive on the Challengers server.