Let me tell you right now the score threshold is between 75000 and 90000. After about 100 hours of Battleborn and most of it put in to story mode I found a way to get crazy amounts of score with little effort actually.
My method requires Kleese and a far amount of knowledge as to how he works. Second is Gear and some very perticuler pieces at that.
So lets start with Gear shall we? You will need a White Quality, 0 cost, 2.10 Shards per second Gear that will in no way effect your damage output. I prefer Reload Speed or Heal power as my negetive stat (these are Jennerite and Rogue faction gear pieces). If your playing Kleese then reload speed dose not effect his chair energy so by all means!
Next you need a Purple Quality, LLC faction, Reduced Buildable Cost/ Shards Per second gear. These are not to incredibly elusive if you are a Story Junky like myself. ( I would recommend playing LLC Battleborn up to Rank 12 to get both there LLC faction pack and an Epic loot pack both with some kind of chance at this gear)
Lastly this is an easy one just get any Purple LLC gear with good stats that has a secondary stat that is more negetive Buildable Cost Primary stat us up to you and your drops.
Now the second factor is what I am now calling "Kleese’s CRAZZY Quick KillZ!!!"
You may have seen it in the Renegade, a Kleese doing decent damage keeping up with the group in damage and score then you get to Defending Caldarius while he is powering up and BAMMM! Doubles the best damage on the score board and now has 40 more kills all in less then a Minute. Kleese has a powerful Helix Combo that will result in devastating amounts of damage in an incredibly short time. The catch is… it is an area of effect that is less then mobile. The Renegades last defense objective has set spwans each wave and Kleese can trap one to kill every enemy that spwans there in less then 20 seconds ergo beating the quick kill times. The Helix combo is as fallows,
Level 4: Rift Network
Level 6: Bulk Savings
Level 8: Brawn befor Brains
This will allow you to multiply your Rift damage output 6 times over AND make them attack more often created a deadly area of effect even Elites cant survive. Br sure that when placing Your Rift Network You Make not just a box but a box with an X in it. You want all the Rifts conected as it DOSE in fact farther increase there damage output past ×4 to x6. Even though you cover less area you will beat all the quick kill timers thus getting you bonus score you need.
Now that we covered that the other things to know is that the shards per second should allow you to have all you gear up before you clear the first Defence Objective and will now give you more then enough shards to buy EVERY buildable in the stage. This will score you even more points build Temporal or reapir drones to help you out. Build all 3 thumper turrets at the enterence to the second defence point. Put Inferno and temporal traps EVERY WHERE!!! Lastly make sure you set up you Rift network at the SECOND waves spawn at the last defense point. Enemies will spawn there at both the second and last wave of the mission.
Hope this helps others get the gold!
Stay Badass all!