Talent points in war mode

Squad Offense I, Squad Defense I, Squad Health I, Squad Health II, Squad Defense II (fill the max of these talents type, and the remaining points must be distributed prioritizing: Ranged Offense III, Cavalry Offense III, and Infantry Offense III).

Turf Boosts

Go to arena using army attack and army size boosts, as it increases your damage in battle and allows you to send more troops for your team's rallies. If you have few troops, or won't work as rally leader in the event, and if you don´t want to be aware of being attacked easily by your enemies, go to arena using antiscout.

War Gears

In dragon arena, its wiser to prioritize gears that are positive for all troops type (mix attack gears), as the needs to keep an Arena Building may vary according to the flow of the event. So, be as general as possible, and develop gears that can increase army attack, and army HP. Between these 3 options, keep in mind that army HP and army ATK gears are the best value cost-benefit. Bellow, there´s a list of each of theses gears type. Be sure to also inlay jewels that can increase their performance (blue jewels are already good for using). If you have your mix atk gears in mythic upgrade, be sure to increase it with astralites. These gears suggested bellow are usually a good fit for mix atk in Dragon Arena:

Helmet: Bumblehelm, or Beast Helm

Armor: Firewall Plate

Legs: Dragon's Talon

Main-Hand: Frostwing Greatsword

Off-Hand: Dragon Fist, or Winter Mitts

Accessory: Ambrosial Cup, or Blight Ring

Prioritize rallies than solo attacks

Rallies are, and will always be stronger than solo attacks. Be sure to open as many rallies as possible for attacking Dragon Arena's Strongholds more efficiently. Rallies also reduce the chance of injuring troops unnecessarily.

Avoid attacking adversaries' turfs

Sometimes, it may seen that attacking adversaries castles is a good deal, because they may probably get weaker and won´t, consequently, attack your arena buildings. However, it can be a lost of time, and army, if your guild is in low numbers. The event doesn´t give points for attacking adversaries troops, so be ready to reinforce your team´ s rallies and Strongholds instead. Get points for your team, as it needs your troops more than your adversaries teasing. 

Special Strongholds

Ancient Remains gives attack boosts that increase significantly the chances of 'luck' in the event. So, be sure to grab an hold it fast, and before your adversary, at the beginning of arena. Ask your guild mates to reinforce it immediately.

Another important Strongholds in arena, are the ones that follows the caravan. Keep in mind that, in dragon arena, the goal is to get points. So, in fact, it doesn´t matter much if the Caravan Strongholds have your guilds mostly castles, but, as long as your adversaries don´t get the points, it is an advantage. Be sure to kick your adversaries as faster you can from caravan Strongholds . 

And don´t forget about Citadels, because the are the Stronghold's type that give the most of points.