Not optimal? This is one of the most optimal support wiz build with still abit some dps for questing alone. My friend actually re-rolled his first wiz and went for this exact build.
Reason,
Lv5 Joint Penaltyās skill point investment is very efficient because you can easily push the targets to 6 with just Divine Might or if you luckily got Joint Penalty +1 gem. Lv10 JP just adds 3 more targets for 5 skill pts, not to mention, you need Divine Might and +1 gem to push it to 9 targets making it an unoptimized choice.
Lv5 Swell Left-arm is one of the best buffs in-game and scales way too good for Lv280 cap. Take Khasti Bow for example. You need to +15 it for it to give an additional 200 atk. Meanwhile Lv5 Swell Left-arm gives 218 atk with max attributes. Leveling it further by taking higher Thauma circles isnāt worth it means you took another optimal choice. Giving everyone a +15 weapon buff is extremely good.
With Chrono C3, youāll be able to easily recast your Flame Ground and chain another set of mobs using Pass. I seriously donāt see this build as not optimal.