Introduction

In March 2019 the Library of War was introduced in King of Avalon. This is a new way to provide boosts to your troops.

Basics

The Hall of War has been extended with a new menu item, Library of War, available when Hall of War is lvl 22 or higher. When activating this item you will see an overview of War Strategies categorized in three sections, Infantry, Bowmen and Cavalry. Each War Strategy provides unique benefits to a troop type or a specific troop type and tier. By assiging Tome of Wars to a War Strategy the benefits of the War Strategy become active.

Available War Strategies

For each of the troop types Infantry, Bowmen and Cavalry there is a War Strategy for each specific tier of troops and two War Strategies that apply to all troops of that type. These general two ones are available as soon as you have built the corresponding troop training building. The tier specific ones are available once you have upgraded the corresponding troop training building to the level that unlocks that tier (at lower levels it isn't useful anyway). Each War Strategy has 5 levels, each require one additional Tome of War.

War Strategies sometimes only apply if certain conditions are met, and for some one boost of your troops is sacrifized to add benefits to another. Make sure the ones you use complement your game play, I share some suggestions below.

Tome of War Requirements

You need a Tome of War to active a War Strategy or upgrade it to the next level. These Tome of Wars require an amount of War Scrolls, standard resources and require time to learn. Each subsequent Tome of War you learn has increased requirements. In table below I show the requirements as far as I know them, please let me know in the comment section if you know requirements for more Tome of Wars.

War Scrolls

At this moment the only free way to get War Scrolls is as one of the rewards from the Royal Arena.

Resetting War Strategies

For 1000 gold you can reset your War Strategies. Resetting will remove all active boosts and return all Tomes of War to you. This is relatively cheap so you don't have to worry too much about making wrong decisions when assigning the Tomes of War.

Tips on War Strategies

If you use different troop tiers for either PvE or PvP combat you should for sure consider going for the War Strategies that provide boosts for all tiers of a troop type.

Since the next Tome of War is going to be more expensive irrespective of whether you assign it to the same or different War Strategies, there is no direct benefit of focusing on different War Strategies, better to determine which one is best for you, upgrade that one to level 5, and only afterwards focus on a new War Strategy.

From the War Strategies that provide boosts to all tiers I like Unassailable (Infantry, increase defense for all infantry troops), Arrows of Vengeance (Bowmen, adds part of the Bowmen Defense to Bowmen Attack), Defiant Charge (Cavalry, adds part of the Cavalry Defense to Cavalry Attack).

I find it difficult to interpret the value of Sacrifice (Infantry). One battle consists of many subbattles and as long as you still have 50% of your original infantry, infantry will absorb damage aimed at other troop types. I guess this is good... (btw, initially I thought march had to contain minimum 50% infantry for this to be active, that understanding was wrong).

I am not a big fan of Iron Skin (Bowmen), since it increases defense of Bowmen, which I don't consider a very important stat; Steel Refuge (Cavalry), since it increases the defense of Cavalry, not as little value as Bowmen Defense, but there are better alternatives.

The tier specific War Strategies for the higher tiers (9-12) all seem quite good, but I will focus on Arrows of Vengeance, Defiant Charge and Unassailable first. After that probably the War Strategies for the troops I use in my pvp March Preset in order of descending amount.

Conclusion

This should give a basic understanding of how the Library of War works and what War Strategies you can focus on. If you have any suggestions or questions please share.