You need to keep leveling a summon if you want to keep using it. It's really that simple. Un-leveled or under-leveled summons get torn apart. You can't utilize Wisps' stun ability if you don't keep them leveled. They will almost never stun anything if their stun level is too low. High level Wisps do have pretty good DPS in mob form, but their stun ability is what makes them shine. Don't gimp the poor guys if you're going to be using them.
Zealous affects all summons, including Spirits. It just doesn't help them as much as Contracts. Regardless, I completely regret getting it. It's the one thing I'd reset out and change about my Spirit Summoner's build. With those 135 points, I could have kept my Murker usable. I may still fix that mistake. I would only consider getting Zealous if you're a Contract Summoner and really can't find another use for the points. Spirit Summoner like me? Don't do it. Hybrid Summoner? Maybe, but I'd say no. I don't like the skill. It doesn't make enough of a difference to be worth it, and it even costs Cubes.
As for the build you posted, I would take points from Train and get max Wisp and Quick Rebound. I love max Train and am a huge supporter of it for Spirit builds, but it's not a vital skill. Quick Rebound is one of the most useful utility skills you can get. Plus it's so cheap. It's certainly fine the way it is, though. Just a couple things to consider.
Double edit: Did not notice you had Library. I know you like that skill, but...yeah. It's really unnecessary. I think it's much better to buff your abilities than waste precious SP on a glorified potion saver. Much better to invest in an MP regen set. I don't have Library, and I never use an MP potion. Kings full clear, any dungeon. You name it. No need. Just watch out for monsters that drain MP. lol
Zealous affects all summons, including Spirits. It just doesn't help them as much as Contracts. Regardless, I completely regret getting it. It's the one thing I'd reset out and change about my Spirit Summoner's build. With those 135 points, I could have kept my Murker usable. I may still fix that mistake. I would only consider getting Zealous if you're a Contract Summoner and really can't find another use for the points. Spirit Summoner like me? Don't do it. Hybrid Summoner? Maybe, but I'd say no. I don't like the skill. It doesn't make enough of a difference to be worth it, and it even costs Cubes.
As for the build you posted, I would take points from Train and get max Wisp and Quick Rebound. I love max Train and am a huge supporter of it for Spirit builds, but it's not a vital skill. Quick Rebound is one of the most useful utility skills you can get. Plus it's so cheap. It's certainly fine the way it is, though. Just a couple things to consider.
Double edit: Did not notice you had Library. I know you like that skill, but...yeah. It's really unnecessary. I think it's much better to buff your abilities than waste precious SP on a glorified potion saver. Much better to invest in an MP regen set. I don't have Library, and I never use an MP potion. Kings full clear, any dungeon. You name it. No need. Just watch out for monsters that drain MP. lol

