You gain a plus 2 to Strength and a plus 1 to Constitution

Whenever you made an Unarmed Strike with your fists or with your head as a headbutt, You leave a small patch of slime within the 5-foot space the creature occupies. Once the slime is dropped, you roll a d4. Take the result, minus one, and that is how many rounds you have until the slime explodes. When it explodes, it deals 1d4 fire damage to anything within the radius, and you are immune to the damage. Every 4 levels, the size of the extra damage increases. At the second increase, the radius of the slime that is left increases to 3x3 square, with the middle square being where the hit took place. After another two levels, you can also knock them prone, but this can only happen a number of times equal to your proficiency bonus per long rest. 

You gain Resistance to Fire damage, and to damage dealt by explosives

Once per day, you can use your Action and Bonus Action to slam into the ground over and over, literally terraforming the area around you.  You create a 30 foot enclosed sphere of solid rock, choosing 4 creatures, friendly or not to be trapped in there with you. No creature can leave the sphere, except for the Teleport spell. The sphere lasts until you use an Action and Bonus Action to break it, or until you die, whichever comes first. While the ring is up, you gains a +3 bonus to your AC, have resistance to bludgeoning damage, gain vulnerability to cold damage, can't be paralyzed or poisoned or deafened. All your slime charges reset, and deal double damage, but you now take half damage from the explosion.