Building Boom Event

Building Boom is one of three events in Clash of Beasts. It is where you build out and level up your city, allowing you forge more beasts during the Forge Fiesta.

During the event you get VP for Gold you spend upgrading Buildings and Essence you spend upgrading Gold Mine.  The most important thing is to build the base you want. After you have the base you want, you can continue building in order to maximize VP.

When it is not the Building Boom event, you will typically want your builder doing long slow builds in your city.  When not in the event you should save all the speed ups you can.  Players will have dozens of days speed ups saved, top players may have hundreds.  Before the event you should check exactly what you will need in order to forge the next set of beasts in the next Forge Fiesta.  You may decide you want to not gain too many levels and instead want to maximize VP.  You could move around towers (use store building), change alignments, get a new god tower. You can also store multiple buildings for long periods of time.

## Building for the Base You Want

There are a few factors in deciding what to build, in order of importance.

* What do you need to build before the next forge event
* What city level do you want
* Base design / defense

Take a look at the Story Quests, Forging Guide, and the Buildings Per City Level to help you decide. Determine if you want to finish all the buildings related chapter quests. Maybe you need a certain beastiary in order to summon and train certain beasts at the next Forge Fiesta. You may have other targets, for example to complete Chapter 5 requires you to scout 5 islands (which takes 7 days).  In order to do that you need to have Resource Silo 11 which is city level 46.  So city level 46 may be an important target city level.

When you increase in level, the targets you are offered will also increase in level and existing targets are worth less in XP. Therefore you will want to be cautious of over-levelling. That would cause you to not be able to attack people in your list, or to get less XP on those that you can hit. It is recommended that you set a target city level based on what you need to do, and don't go far beyond that.

For most people your primary goal during this event is to upgrade what you need to complete story quests and allow you to breed what you want during the next Forge Fiesta.  If you need to level up, focus on towers as they give you the most City XP.

## Building to Maximize VP

If you want to maximize VP and don't care if you increase your city level, then the first thing you should do it make sure all your towers are fully upgraded to their maximum level.

If you want to maximize VP and and do not want to increase your city level, then then you will be scavenge a tower (destroying it to get some Speed Ups) and rebuilding the tower. Read below on how to scavenge.

In order to maximize the VP, you want to spend a lot of gold for short build times.

After the initial few levels, most towers start at low VP per hour and the bigger tower you build the more VP you get for the timers you spend. Except Void Cannon and Void Tower use a different pattern.  Those work in reverse, they start at very good VP and the more levels the worse the VP for time spent. They are significantly better than all other towers in VP per hour spent, the effect is increased the lower level you scavenge at. This will use a lot of 10-30 minute Speed Ups nothing larger than 3h.  To use the larger timers, you should be building God towers such as Slern. In addition, as of the writing of this (May 29) there is a bug in the data that made Void Inferno level 8 to be the sweet spot to build.

* Void Cannon 5 - 256 VP/hr
* Void Cannon 8 - 88 VP/hr
* Void Cannon 10 - 44 VP/hr
* Void Cannon 5 - 256 VP/hr
* Void Inferno 8 - 168 VP/hr (2650 VP in ~16 hours)
* Void Inferno 10 - 52 VP/hr

The best VP is:

* Spirit Tower (gold only)
* Resource Silo
* Scavenge and rebuild Void Cannon/Inferno up to level 10
* Scavenge and rebuild other towers
* Other city (much worse)

## Recommendation

Before you start, if you have researched Deeper Cuts, make sure that you have specialized to the Defense Tree for the event for faster build times. Note that you can always change your specialization at any time, it is only needed at the time you start the build. See Research and Soul Dust for more info.

When the event starts you can use speed ups in all your buildings.  You may spend most of your speed ups in the first day however you may be gold limited.  At higher levels 1 day of speed ups costs around 100k gold.  So if you have 70 days of speed ups you will need 7 million gold.  This is a good time to do a Gold Mine boost, and you will need to raid often to get the gold you need.  If you do not have enough gold click on the pay button anyway and it will ask you if you wanted to use Gold Sacks and similar objects. Remember to collect rewards because that will include more speed ups.  Hold some speed ups back, and use them to make sure that you have your builders busy at all times during the event.

Determine what you need to upgrade for your targets. If you need to gain city levels, upgrade towers to the maximum level that you can right now. If you are tying to complete a chapter and there are city building upgrades, those tend to be low VP. However since Soul Forge and Beastiary are so important to the Forge Fiesta, I would upgrade them during Building Boom. I would also upgrade Resource Silo since that has high VP return. However I would generally not upgrade other city buildings during the event. There are ten days between the end of Building Boom and the start of Forge Fiesta. At lower levels this is enough time to upgrade a lot of the city buildings, at high level it is not enough. This is a personal decision.

When you are at the City Level you want to be, you can switch to building to maximize VP.

When you are running low on Speed Ups or it is near the end of the event you should judge your VP in the Personal milestone.  Spend enough to make a personal milestone and then stop.  Near the end don't use Speed Ups for VP if you don't get an additional reward.

Do not stress out about your builder being idle for a minute, or wasting a minute of speed up.  If you are doing 50 days of speed ups don't care about the lost minutes.  Always use the largest speed up you can (do not use multiple three hours speed ups instead of a twelve hour).

You might want to have your workshop producing 3m speed ups if you are running low.  Although less efficient in the workshop, they can be more efficient when being used.

To summarize:

* Upgrade existing towers until you are a few levels below your city target level.
* Upgrade Resource Silo, Soul Forge, and Beastiary to whatever maximum is available.
* Optional depending on level: Upgrade Architect Study and Workshop to whatever is required for the chapter (may be less then your current max).
* Upgrade existing towers until you are at your target city level.
* Scavenge and rebuild to maximize VP gain

After the event is done, if you have researched Lighter Materials, make sure that you have specialized to the Management Tree after the event for bonus XP. Use the time between events to upgrade Mine/Well, and to upgrade Spirit Tower (using spirit coins).

## Scavenge

Once you are at your target level if you want stay there then you can use Scavenge to remove a tower and then rebuild it.  This is a way of grinding VP for this event because you can continue building and using speed ups without gaining city levels.

Select a tower that is fully built and has high VP value (see above for the best VP) and scavenge it.  You will get back a portion of the time spent (roughly 70%) in speed ups.  Most of the speed ups will be large value (like a 48 hour speed up).

Rebuild the same tower.  The initial levels of a building are always cheap and use up a lot of small speed ups.

Because the building uses small speed ups but the scavenge give you big speed ups sometimes you end up with large speed ups you cannot spend easily.

If you rebuild the tower exactly your city level should not change.

You can repeat this several times, scavenging and rebuilding.  Because you don't get full speed ups back there is diminishing returns.

For example if you have 10 days of speed ups assuming 68% you will:

* Use 10 days. Scavenge 6.8 days
* Use 7 days. Scavenge 4.6 days
* Use 4.9 days. Scavenge 3.1 days

If you keep going in this pattern you will end up with roughly 31 days of speed ups. It might be less due to rounding and diminishing returns, but a good rule of thumb is that with Scavenge you will get 3x the use of the timers.

I have seen Scavenge amounts between 66% and 71%. I suspect the underlying calculation might be something like:

* Base cost of tower is 1000 minutes
* Because of research Helping Hand the player sees it taking -5% less time
* So you spend 950 minutes of speed ups.
* Scavenge is 65% of the original cost, therefore 650 minutes
* User sees 950 minutes spent scavenging 650 minutes which is 68.4%
* Due to rounding to timers, the actual percentage floats around a bit