focus

"You can't depend on your eyes when your imagination is out of focus."

– Mark Twain

Battle Focus is a skill that allows you to regenerate mana and stamina passively even when wearing metal armor. It is especially usefull to dexers using the special combat moves as they eat up your stamina and to Paladins as the Chivalry spells use mana. Since dexers cannot meditate while wearing metal armor (unless they wear mage armor), Focus comes in handy to save the day. Note that dexers aren't the only one to be able to benefit from battle focus. A mage could also use this skill to regenerate his mana and stamina, especially when participating in PvP activities.

This is one of the easiest skills to train ever simply because it trains itself. Battle Focus is movement based. This means you will gain faster when moving around. Every time your mana or stamina levels goes down, you stand a chance to gain Focus during recovery. I.e. you cast a spell, mana is used. While you recover your mana, you will gain focus. You run for a while or carry an item while being overweighted, your stamina will go down. While recovering, you will once again stand a chance to gain focus.

In short, you to train Focus, all you have to do is lower your stamina or mana. So, you can either gain it passively while working another skill such as magery or any combat skill (if your stamina drops regularly enough). Or actively by altering your stats. The cheapest way to do so is to jump on a boat and do 8x8 while putting on and off a magical wizard's hat. It will increase your int by 5 hence giving you room to gain mana. Once your mana is full, remove the hat to drop your int cap then put it back on, which will once again give you room to gain. Another way is to make yourself extremely overweighed. Each time you will try to make a few steps, you stamina will drop like a rock. Then just stay put while sailing and as your stamina regenerates, your gains in Focus will skyrocket.