Co-op Mission Guide: Lock & Load

Ulnar

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Mission Summary

Amon seeks to destroy Ulnar before it can be used to open a gate to the Void. You and your ally must take control of the celestial locks before their energies overload.

Objectives

Primary Objective

Secondary Objective

Enemy Base Analysis

Change all base analysis pictures to race:

Protoss
Terran
Zerg

The goal of the mission is to capture all the Celestial Locks before they overload. You capture a Lock by moving a unit and an ally's unit near the Lock.

When the enemy captures a Lock, an overload ticker will start. When the overload ticker reaches 9000, you will fail the mission. Note that in-game, this is shown as a percentage. The speed of the overload changes depending on how many Locks the enemy has captured. The table below summarizes this information.

Captured Locks Ticks per Second Time to Mission Fail
0 0 -
1 6 25:00
2 7 21:25
3 8 18:45
4 9 16:40
5 10 15:00

The first Lock that is captured is usually the middle lock. This is very lightly defended, and usually a hero unit can clear.

lock_c Picture
Protoss
Terran
Zerg


lock_c Minimap

The next Lock that is captured is usually either the West or the Southern Lock. The Western Lock is shown below. Note the presence of cloaked/burrowed units.

lock_w Picture
Protoss
Terran
Zerg


lock_w Minimap

The Southern Lock is shown below. Note the presence of Capital Ships.

lock_s Picture
Protoss
Terran
Zerg


lock_s Minimap

The Eastern Lock is one of the more difficult Locks to capture, due to the presence of Hybrids and high-HP units. You will need to push up one of the two ramps to get to the Lock.

If you choose to push from the Southern ramp, there is a small enemy camp in this location as follows. Note the presence of cloaked units.

lock_e_bottomcamp Picture
Protoss
Terran
Zerg


lock_e_bottomcamp Minimap

If you choose to push from the Northern ramp, there is also a camp, but guarded by two Hybrid Destroyers.

lock_e_topcamp Picture
Protoss
Terran
Zerg


lock_e_topcamp Minimap

The Eastern Lock is well-defended by Capital Ships and a Hybrid Dominator.

lock_e Picture
Protoss
Terran
Zerg


lock_e Minimap

The last Lock that has to be captured is the Northern Lock. Like the Eastern Lock, there are two ramps that can be used to access it. The Southern ramp is guarded by a small force of units.

lock_n_rampguard Picture
Protoss
Terran
Zerg


lock_n_rampguard Minimap

If you choose to go up the Eastern ramp, you can bypass the above force entirely.

lock_n Picture
Protoss
Terran
Zerg


lock_n Minimap

Completing the Bonus Objective

Xel'Naga Construct

The bonus objective requires you to kill the Xel'Naga Construct. The Construct is guarded by a small force of enemy units as shown below.

xelnagaconstruct Picture
Protoss
Terran
Zerg


xelnagaconstruct Minimap

The Xel'Naga Construct can be quite difficult to kill in the early game. Usually, it is much easier to kill it on the way to Northern Lock if that is the last Lock to be captured.

Timings

Note: Information on Tech and Strength levels can be found on the Enemy Compositions page.

Enemy attack waves will target certain Locks first. The first player-captured Lock on their list will be their target. If all the Locks on their list are overloaded (ie. enemy-controlled), they will target your base.

The attack wave timings, Strength and Tech Levels, and their Lock targets are shown below. Here, "O" stands for the middle lock.

Wave Time Tech Level Strength Level Lock Target Check List Notes
1 4:00 1 3 O Single Wave from the Left
2 8:00 2 4 S ⇨ O Single Wave from the Right
3 11:00 3 5 N ⇨ W ⇨ O
E ⇨ S ⇨ O
Double Wave
4 14:00 3 5 W ⇨ O
S ⇨ O
Double Wave
5 17:00 4 6 N ⇨ W ⇨ O
E ⇨ S
Double Wave

After the 5th attack wave, the subsequent attack waves will follow a fixed pattern, starting from the 19-minute mark as shown below.

Time Tech Level Strength Level Lock Target Check List Notes
19:00 5 6 S
W
Double Wave
21:00 6 6 N ⇨ W
W ⇨ O
Double Wave
23:00 4 6 W ⇨ O ⇨ S
E ⇨ N
Double Wave
25:00 4 6 N ⇨ W
E ⇨ S
Double Wave

The pattern above will repeat every 2 minutes indefinitely.

Spawn Points

Attack waves have two gather points each on the left and on the right side of the map. The gather point selected will be the closest to the target. In most cases, the Northern gather point will be selected. The Southern gather point is only selected if the attack wave ends up targeting a player's base.

The gather points on the left side of the map are shown below:

Left Gather Points

The gather points on the right side of the map are shown below:

Right Gather Points

Mission Tips

Commander-specific Tips