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After dumping over a hundred Skill Points, I leveled to max most of my Skills! The most interesting ones aside from the evolved ones were the old Skills I've been ignoring for a while. Always, whenever a Skill reaches Level 10, they gain brand new effects that can be rather gameplay-defying!
Now Photosynthesis can act even when there's not even sunlight or day, as it can activate if I bring a Sunlight Spirit to enchant me with its sunlight, although the effects are reduced by -50%, it still an amazing passive buff that will always be there.
However, that alone isn't everything, Life Drain has become completely amazing as well, and it is further enchanted as I can merge it with the Great Spirit's Aura I can bring out with my pact with the Great Spirit of Harvest and Nature.
However, those weren't the only Skills that got such amazing enchantments:
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[Plant Synthesis: Lv10 (Max Level)]
Check "The Protagnist's Sister Is Actually the Strongest"!