Mancer Observatory is the proving grounds for the Calamity Cannon. It’s the final Proving Grounds challenge, and the hardest to complete in a single run.
Using your Cannon, you must defend 7 conductors from an invasion of 75 Gasfellas. Although they’re not that strong, they’re small and hard to hit with the Cannon.
That’s why it’s recommended that you settle for the 3rd prize on your first run, so you can fully upgrade the Cannon. Without the tier 5 upgrade, it’s almost impossible to reach the 1st rank.
|1st||All 7 Conductors remain||“Calamity Rockets” Secret Skill|
|2nd||4 Conductors remain||“Something Burnt” Upgrade Material|
|3rd||1 Conductor remains||“Something Wrong” Upgrade Material|
The Cannon can kill all Gasfellas in one shot, so boosting its damage won’t be that useful.
Instead, you’ll want upgrades that improve its handling and effectiveness.
The best upgrade is at tier 5, but you can only get the material for it after a successful attempt at the Observatory. For that to happen, you’ll need all these upgrades first.
|Calamity Cannon Upgrades|
|1||Supercharged Emitter||Rockets cause knockback|
|2||Blast Generator||+20% Blast radius|
|3||Speed Configuration||+35% Reload speed|
|4||Incendiary Fuel Cell||+20% Blast radius|
|5||Tracking Processor||Rockets seek out foes|
Note: You can get one “Something Wrong” material from Zulten’s Hollow — the same level where you got the Cannon. Two more can be bought in the Lost-and-Found. You can also win another from the Scrap Yard proving grounds.
Strategy + Tips
Tip #1: Shoot from in front of your target and not from a diagonal
Since the Gasfellas are always moving forward, it’ll be hard to hit them if you’re aiming from a diagonal.
You’ll need to lead your shots, which can be difficult to pull off. The Gasfellas can also change course while you’re still aiming.
So you should always try to aim from in front of them if you can.
Tip #2: Don’t shoot Gasfellas that have gotten close to a conductor
Once a Gasfella reaches a conductor, they’ll start dismantling it. The danger there isn’t in their attack; it’s in getting rid of them.
If this happens, shooting the Gasfellas will also destroy the conductors due to the Cannon’s AoE.
The solution to this is to not let it happen at all.
If a few Gasfellas do get past you, don’t shoot them. Keep blasting the ones that are still coming at you. When the only ones left are those near the conductors, kill them by rolling at them instead of shooting.
Tip #3: Once you’ve fully upgraded the Cannon, keep spamming rockets until you win
The tier 5 upgrade enables your rockets to home in on enemies. This eliminates the need for aiming.
As long as you’re pointing at the Gasfellas’ general direction, you’ll always hit them.
So keep firing even if they’re beyond your line of sight.
You can also switch your upgrades at tiers 2 and 4 to the ones that improve your charge up speed. You’ll shoot faster with them in exchange for a smaller blast radius. And the blast radius won’t matter anymore because of the homing rockets.
After the ordeal, you’ll get prizes based on the status of the conductors.
- If there’s only one conductor left intact, you’ll get a Something Wrong for your Cannon.
- If there’s at least four left intact, you’ll get a Something Burnt for the Galleon Mortar.
- If you’ve saved all conductors, you’ll unlock the “Calamity Rockets” Secret Skill for the Cannon.
Secret Skill: Calamity Rockets
“Okay, now that’s just plain overkill. I mean, come on!”
—Rucks’s comment on the Calamity Rockets
You’ll unleash a rapid salvo of small rockets for 3–4 seconds. A couple of those rockets can obliterate most enemies.
So imagine how much damage you can do with a hundred of them shooting out of your Cannon. You can also redirect this flurry on anything that you want erased.
- Mancer Observatory: Proving Grounds 12 (Bastion Guide)