Aksinis, Bound by Honor is a fallen enemy that is hiding inside The Empty Tank lost sector located on the Tangled Shore. The Empty tank is the lost sector that is located right next to the spider lair. The enemy is a part of the newly added quest called Raising our Defenses, you have to take him down.
Destiny 2 – Aksiniks, Bound by Honor’s Location
Once you are inside The Think Tank lost sector, take down all the enemies in front of you. This is similar to all the lost sectors in the game, I am sure at this point you are familiar with clearing the lost sectors. Just take out the enemies, just keep in mind this is a yellow bar boss and you might need the right weapons to take him out.
After taking Aksiniks out, head back to The Spider for quest progression.