And a little something to add...
Wanting Ballista to become more popular is always good. because as is, Theres probably less than 5% of the entire population who even knows theres NPC that exist to tell you Ballista schedules.
That is the universal symbol of a failed event. It would be nice if it got some kind of update. I'm sure a lot of people would complain, but if there was a big "Ballista/PVP Patch" I think it would be for the better of a game, It would give people a reason to actually get the best armor.
This patch would have to address a lot of Issues
*Accessibility. They need to add an area like "The Arena", A "Any time you want" Kind of battle area to challenge others. Dior-Ghelsba was nice, But its 1 zone, Abj-Island.. Same problem. A full Arena Battle area with multiple "Fields" to combat on would be ideal. Accessible any time.
*Rewards. Give rewards that make it worth doing as well. It doesn't need to be epic, But something other than doing it for shits and giggles. I can't honestly make any suggestions, But adding Victory spoils to the winner might be a bit nice. Doesn't need to be huge, Just so long as its not logs and ores.
*Fixing of the System. Find a way to work around Swapping gear, even if it means locking your Characters Visual model during Ballista matches, so when you swap gear, you wont blink. A big big issue for me, and a lot of others, is gear swap penalties. It cheapens Ballista. Also completely rebalancing Weaponskills and magics inside Ballista would help. which brings me to my next point
*Tanaka the event: A.K.A Balance. There needs to be serious consideration to abilities and damage formulas/etc in Ballista. Some jobs are admittedly way to overpowered. Sure theres ways to combat it, But no job should have the ability to floor you in 1-2 hits max, in a time-frame of a few seconds.
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Now, In my opinion, I think while in Ballista, All players max HP Should be doubled. Battles are way to short in Ballista and usually consist of "Hit until you get TP > WS, Whoever gets TP first wins!", There should be a little more than that. I can't give you any ideas but hey, it would be nice.