Hi,
The SPR path is this one:
https://tos.neet.tv/skill-planner#2111aaa6kk.21617a85.1f6a75.157585
Built around Thauma/Sorc and Omni.
SPR is helping a lot your summon and if you select one with a strike AA (Gorkas and Necroventer are nice and cheap ones), Wiz3 is helping a lot with the lethargy attribute. Thauma is also improving your summons both offensively and defensively.
Took 5 min to do the math:
600 INT is equal to 1350 Matt and give you 0 benefit on Swell brain.
If you have 600 SPR instead, Lvl 6 Swell brain (gem or divine might) is giving you and your party 606 Matt bonus. If you have the Gem and divine might while casting the spell, this is pushed to 800 Matt.
In fact you gain damages on your summon, a lot of SP to use your spells without poping pots at every cooldown at the expense of a bit of Matt.
For the left over points:
If you use the new earth necklace: https://tos.neet.tv/items/582132
With lethargy and on ground type monster the +50% skill ratio is quadrupled when using Earthquake. It has a low cd and 3 OH. Really decent.
It also affects the tree initial damage and dot damage (from the attribute) and Toyou (it is added on each hit every 0.3 sec).
If you don’t use the necklace or don’t use the earth spells:
Sleep is also an option to enhance Howling tiger. It is sadly not working on bosses, flying monsters and difficult to pull out when partying because of the limited number of hits .