Thx, but it doesn't work. Also i found this information in comments: -Green Slime : Slime Dungeon - Random Floor. Be careful, though : You can only increase its stats by using Potions and the Potions' effects dissipates after a fight.
Wait, everything ok. When i give any potion to slime follower during battle gives 5 points of stat which potion is for.
Different way to upgrade follower.