The chieftains and some bosses like Bassus or Escharum are very unforgiving and unfair to fight, with the ability to teleport from the other side of the boss room and basically one shot the player in a fraction of second. The player can do nothing about it other than running away with the grapple-shot, the thruster skill does not allow the player to simply dodge the attack nor can it be blocked by any other ability
I believe buffing the thruster range /speed would allow the player to dodge the bosses attacks much more efficiently. If buffing the thruster is out of question, then introduce the Repulsor in the campaign. Not only will it resolve the problem of bosses teleporting by allowing the player to time their ability and push them back, but it will also improve drastically the experience and even add more crazy speedrunning tricks to the game
- The ability could be harvested from a dead spartan near the bassus room or from the first FOB we clear (upgrades to the ability could include decreasing the cooldown, increasing the range and the force)