Tools

There are a large number of tools in the game that can be used when attacking/defending. They can be divided by use (and also by filter) into:

Basic tools (the weakest tools, you can produce them with resources in your workshops)
Premium tools (you can buy them for rubies)
Elite tools (stronger tools, some of them are for rubies, but you can obtain them also for example from Master Blacksmith for silver coins)
Event tools (these tools are specific in that they usually include bonuses for event currencies. For example khan chest has +3% to looted khan tablets. These tools, unlike normal tools without bonuses, are always consumed in battle)
Combo tools (these tools are the strongest. But in order to craft them, you need to research them in the Hall of Legends and have the workshops built at level 4. Each attack tool is limited by a certain maximum per wave. Support tools are limited to 1 per attack/defense)

You can see almost all of them here:

Basic tools