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Focus is important for maintaining stamina. You can keep full stamina by other means without Focus through the use of the right equipment that has Stamina Increase and Regeneration, weapons with Stamina Leech and as a Paladin, using Divine Fury. Although the following picture I show is of my Sampire, my Paladin Archer is suited up very closely the same. He spends most of his time at sea, having started life as a fisherman. 120 Fishing is soul stoned for 120 Healing when fighting pirates and beacons. He has 120 Anatomy, Chivalry, Archery, Tactics, Healing and Resist Magic when not fishing and instead is fighting orcs, pirates and others. My Focus is stored away because this set up seems to ensure I do not need it. My bows at sea have life and mana leech, slayer property, full swing speed increase, and damage increase. Only when I am hit do I lose some stamina, but it is acceptable. If fighting on land and not at range on my ship, I will replace my bows with those that have Stamina Leech as opposed to Life Leech. Of course, this is my luxury as an old player that began the game as a crafter. I can make what my warriors need to specification without Focus. If I couldn't there is that time when you need it on you. Make sense?
Early essays I read often recommended players starting out as warriors include focus in their templates, but nowdays I very rarely see it in recommended templates and I don’t use it in any of mine. Think it’s operation is similar to meditation for mages but over the years unlike meditation it has been replaced by other combat skills. Maybe might be useful for a resource gather that carries a lot of weight and usually overweight. Focus might help the overweight traveler to walk a little further.