Difference between revisions of "UFO Incursions (Apocalypse)"
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− | This page lists the | + | This page lists the various nuts and bolts of how the game decides which [[Alien Craft (Apocalypse)|Alien Craft]] come out of the [[Dimension Gates]] and what they do once in [[Mega-Primus]]. |
− | + | Unlike in UFO: Enemy Unknown and X-Com: Terror From the Deep, the [[Aliens (Apocalypse)|Aliens]] in X-COM: Apocalypse do '''not''' have infinite reserves of craft. Rather, the pool of craft in the [[Alien Dimension (Apocalypse)|Alien Dimension]] is tracked, with new UFOs being constructed every Monday (up to a limit) and X-COM interceptions removing craft from the pool. | |
− | + | Every time an alien mission is scheduled, the game rolls randomly on a table to decide what act they will attempt to perform. This table changes every week. Then, once an act has been selected, the specific UFO makeup of the incursion is chosen deterministically from tables for each possible act depending on what craft are available in the Alien Dimension pool; as reproduced here, the tables increase in priority downward, so the aliens will always use the highest-numbered fleet possible for the chosen mission. | |
− | + | Some UFOs on the Infiltration and Overspawn Drop tables are listed as "Bombing" craft. These craft will bomb a building, as though on an Air Raid mission. | |
− | + | There is one special UFO incursion, generally called the Apocalypse Mission. This is triggered when X-COM destroys the [[Control Chamber]], and is an Air Raid mission consisting of '''all''' remaining alien craft except [[Alien Probe (Apocalypse)|Probes]]. As such, it is not found on the mission-choice table and has no fixed UFO makeup. | |
− | ==Mission | + | ==UFO Availability== |
+ | |||
+ | {| {{StdCenterTable}} | ||
+ | |- {{StdDescTable_Heading}} | ||
+ | !Week!![[Image:Apoc_ufo1_icon.png|Alien Probe]]!![[Image:Apoc_ufo2_icon.png|Alien Scout Ship]]!![[Image:Apoc_ufo3_icon.png|Alien Transporter]]!![[Image:Apoc_ufo4_icon.png|Alien Fast-Attack Ship]]!![[Image:Apoc_ufo5_icon.png|Alien Destroyer]]!![[Image:Apoc_ufo6_icon.png|Alien Assault Ship]]!![[Image:Apoc_ufo7_icon.png|Alien Bomber]]!![[Image:Apoc_ufo8_icon.png|Alien Escort Ship]]!![[Image:Apoc_ufo9_icon.png|Alien Battleship]]!![[Image:Apoc_ufo10_icon.png|Alien Mothership]] | ||
+ | |- | ||
+ | |1||9||9|||||||||||||||| | ||
+ | |- | ||
+ | |2||2||4||3||2|||||||||||| | ||
+ | |- | ||
+ | |3||2||4||2||2||||3|||||||| | ||
+ | |- | ||
+ | |4||1||2||1||1||2||2|||||||| | ||
+ | |- | ||
+ | |5||||1||||1||1||1||2|||||| | ||
+ | |- | ||
+ | |6||||1||||1||1||||1||1|||| | ||
+ | |- | ||
+ | |7||||1||||||1||||1||1||1|| | ||
+ | |- | ||
+ | |8||||1||||||||1||1||1||||1 | ||
+ | |- | ||
+ | |9||||||||||||||||1||1|| | ||
+ | |- | ||
+ | |10||||1||||||||||1|||||| | ||
+ | |- | ||
+ | |11||||||||1||||1||||||1||1 | ||
+ | |- | ||
+ | |12||||||||||||||1||1|||| | ||
+ | |- | ||
+ | |13||||1||||1||||||||||1|| | ||
+ | |- | ||
+ | |14||||||||||||||||1||||1 | ||
+ | |- | ||
+ | |15||||||||||||||||||1|| | ||
+ | |- | ||
+ | |16+||||||||||||||1||1||1||1 | ||
+ | |- | ||
+ | |Maximum||15||15||6||6||6||6||6||6||4||2 | ||
+ | |} | ||
+ | |||
+ | ==Mission Chance== | ||
{| {{StdCenterTable}} | {| {{StdCenterTable}} | ||
|- {{StdDescTable Heading}} | |- {{StdDescTable Heading}} | ||
− | !Week!!Infiltration!! | + | !Week!!Infiltration!!Base Assault!!Air Raid!!Overspawn Drop |
|- | |- | ||
|1-3||100%||0%||0%||0% | |1-3||100%||0%||0%||0% | ||
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<th>Primary</th> | <th>Primary</th> | ||
<th>Escort</th> | <th>Escort</th> | ||
− | <th> | + | <th>Bombing</th> |
<th>Week</th></tr> | <th>Week</th></tr> | ||
<tr><td align="left">1</td><td>[[Image:Apoc_ufo2_icon.png|link=Alien Scout Ship (Apocalypse)]][[Image:Apoc_ufo2_icon.png|link=Alien Scout Ship (Apocalypse)]]</td><td>[[Image:Apoc_ufo1_icon.png|link=Alien Probe (Apocalypse)]]</td><td></td><td>1</td></tr> | <tr><td align="left">1</td><td>[[Image:Apoc_ufo2_icon.png|link=Alien Scout Ship (Apocalypse)]][[Image:Apoc_ufo2_icon.png|link=Alien Scout Ship (Apocalypse)]]</td><td>[[Image:Apoc_ufo1_icon.png|link=Alien Probe (Apocalypse)]]</td><td></td><td>1</td></tr> | ||
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* UFO fleets led by [[Alien Transporter (Apocalypse)|Transporters]] or [[Alien Assault Ship (Apocalypse)|Assault Ships]] are always on Infiltration missions. | * UFO fleets led by [[Alien Transporter (Apocalypse)|Transporters]] or [[Alien Assault Ship (Apocalypse)|Assault Ships]] are always on Infiltration missions. | ||
− | == | + | ==Base Assault Fleets== |
<table {{StdCenterTable}}> | <table {{StdCenterTable}}> | ||
<tr {{StdDescTable_Heading}}><th align="left">Mission</th> | <tr {{StdDescTable_Heading}}><th align="left">Mission</th> | ||
Line 97: | Line 138: | ||
* Subversion fleets can appear from Week 5 onwards. | * Subversion fleets can appear from Week 5 onwards. | ||
− | == | + | ==Air Raid Fleets== |
<table {{StdCenterTable}}> | <table {{StdCenterTable}}> | ||
<tr {{StdDescTable_Heading}}><th align="left">Mission</th> | <tr {{StdDescTable_Heading}}><th align="left">Mission</th> | ||
Line 117: | Line 158: | ||
* Attack fleets appear from Week 4 onwards. | * Attack fleets appear from Week 4 onwards. | ||
− | ==[[Overspawn]] | + | ==[[Overspawn]] Drop Fleets== |
<table {{StdCenterTable}}> | <table {{StdCenterTable}}> | ||
<tr {{StdDescTable_Heading}}><th align="left">Mission</th> | <tr {{StdDescTable_Heading}}><th align="left">Mission</th> | ||
<th>Primary</th> | <th>Primary</th> | ||
<th>Escort</th> | <th>Escort</th> | ||
− | <th> | + | <th>Bombing</th> |
<th>Week</th></tr> | <th>Week</th></tr> | ||
<tr><td align="left">1</td><td>[[Image:Apoc_ufo10_icon.png|link=Alien Mothership (Apocalypse)]]</td><td></td><td></td><td>8</td></tr> | <tr><td align="left">1</td><td>[[Image:Apoc_ufo10_icon.png|link=Alien Mothership (Apocalypse)]]</td><td></td><td></td><td>8</td></tr> |
Revision as of 10:32, 12 July 2020
This page lists the various nuts and bolts of how the game decides which Alien Craft come out of the Dimension Gates and what they do once in Mega-Primus.
Unlike in UFO: Enemy Unknown and X-Com: Terror From the Deep, the Aliens in X-COM: Apocalypse do not have infinite reserves of craft. Rather, the pool of craft in the Alien Dimension is tracked, with new UFOs being constructed every Monday (up to a limit) and X-COM interceptions removing craft from the pool.
Every time an alien mission is scheduled, the game rolls randomly on a table to decide what act they will attempt to perform. This table changes every week. Then, once an act has been selected, the specific UFO makeup of the incursion is chosen deterministically from tables for each possible act depending on what craft are available in the Alien Dimension pool; as reproduced here, the tables increase in priority downward, so the aliens will always use the highest-numbered fleet possible for the chosen mission.
Some UFOs on the Infiltration and Overspawn Drop tables are listed as "Bombing" craft. These craft will bomb a building, as though on an Air Raid mission.
There is one special UFO incursion, generally called the Apocalypse Mission. This is triggered when X-COM destroys the Control Chamber, and is an Air Raid mission consisting of all remaining alien craft except Probes. As such, it is not found on the mission-choice table and has no fixed UFO makeup.
UFO Availability
Week | ||||||||||
---|---|---|---|---|---|---|---|---|---|---|
1 | 9 | 9 | ||||||||
2 | 2 | 4 | 3 | 2 | ||||||
3 | 2 | 4 | 2 | 2 | 3 | |||||
4 | 1 | 2 | 1 | 1 | 2 | 2 | ||||
5 | 1 | 1 | 1 | 1 | 2 | |||||
6 | 1 | 1 | 1 | 1 | 1 | |||||
7 | 1 | 1 | 1 | 1 | 1 | |||||
8 | 1 | 1 | 1 | 1 | 1 | |||||
9 | 1 | 1 | ||||||||
10 | 1 | 1 | ||||||||
11 | 1 | 1 | 1 | 1 | ||||||
12 | 1 | 1 | ||||||||
13 | 1 | 1 | 1 | |||||||
14 | 1 | 1 | ||||||||
15 | 1 | |||||||||
16+ | 1 | 1 | 1 | 1 | ||||||
Maximum | 15 | 15 | 6 | 6 | 6 | 6 | 6 | 6 | 4 | 2 |
Mission Chance
Week | Infiltration | Base Assault | Air Raid | Overspawn Drop |
---|---|---|---|---|
1-3 | 100% | 0% | 0% | 0% |
4 | 90% | 0% | 10% | 0% |
5-6 | 80% | 10% | 10% | 0% |
7 | 70% | 10% | 10% | 10%* |
8 | 50% | 20% | 10% | 20% |
9-11 | 40% | 20% | 20% | 20% |
12 | 30% | 30% | 20% | 20% |
13 | 30% | 20% | 30% | 20% |
14 | 40% | 20% | 20% | 20% |
15-18 | 30% | 20% | 20% | 30% |
19 | 20% | 20% | 30% | 30% |
20+ | 10% | 40% | 20% | 30% |
*An Overspawn drop in Week 7 can't actually happen, as there are guaranteed to be no Motherships available (none have spawned yet).
Infiltration Fleets
Mission | Primary | Escort | Bombing | Week |
---|---|---|---|---|
1 | 1 | |||
2 | 1 | |||
3 | 2 | |||
4 | 2 | |||
5 | 2 | |||
6 | 4 | |||
7 | 3 | |||
8* | 4 | |||
9 | 3 | |||
10 | 3 | |||
11 | 4 | |||
12 | 4 | |||
13 | 5 | |||
14 | 8 | |||
15 | 8 | |||
16* | 7 | |||
17** | 7 | |||
18 | 7 | |||
19 | 8 | |||
20 | 8 |
*These fleets will never appear, as the ships required will also fulfil a higher-priority fleet.
**This fleet can appear as long as the aliens have at least one Battleship and one Escort Ship (though two Battleships will still appear in Mega-Primus). This is the result of a bug in the spawn routine; instead of checking whether there are two Battleships, it checks whether there is one Battleship twice.
- UFO fleets led by Transporters or Assault Ships are always on Infiltration missions.
Base Assault Fleets
Mission | Primary | Escort | Week |
---|---|---|---|
1 | 5 | ||
2 | 5 | ||
3 | 5 | ||
4 | 5 | ||
5 | 5 | ||
6 | 5 | ||
7 | 5 | ||
8 | 5 | ||
9 | 7 | ||
10 | 8 |
- Subversion fleets can appear from Week 5 onwards.
Air Raid Fleets
Mission | Primary | Escort | Week |
---|---|---|---|
1 | 4 | ||
2 | 4 | ||
3 | 5 | ||
4 | 4 | ||
5 | 5 | ||
6 | 6 | ||
7 | 7 | ||
8 | 9 | ||
9 | 9 | ||
10 | 8 |
- Attack fleets appear from Week 4 onwards.
Overspawn Drop Fleets
Mission | Primary | Escort | Bombing | Week |
---|---|---|---|---|
1 | 8 | |||
2 | 8 | |||
3 | 8 | |||
4 | 8 | |||
5 | 11 |
- Overspawn drops can appear from Week 8 onwards.
- A fleet with two Motherships is guaranteed to be on an Overspawn Drop mission.