This is my feedback as archer’s player.
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Lock target: I feel that the distance of its is too short. Especially when I need to jump around a lot in solo quest with a lot of boss’s minions around.
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Focus target: This does not work properly. Sometimes, it focus on the nearest enemy. Sometime when I turn around to lure enemy, it focus on the farest one at the edge of the screen. Well, I will have time to change focus while in party, but there are a lot of quests I have to do alone.
I think you should make this feature more convenient. It should focus on the boss first; next, the one with low hp and last is the one nearest.

