Features:

This mod adds 6 different gems Strength, Regenerate, Rabbit, Cursed, Debuff, and Defense gems

I don't know how to randomize which gem you get on spawn you might need to use FTB questing.

Gem powers:

Strength Gem gives you strength 2 at level 1, 3 at level 2, and 5 at level 3.

Defense Gem, gives resistance 1 at level 1, 2 at level 2, and 3 at level 3.

The defense gem also gives absorption on right-click. Absorption 1 at level 1, 3 at level 2, and 5 at level 3.

The rabbit gem gives speed 1 at level 1, speed 3 at level 2, and speed 4 at level 3.

The rabbit gem has a 2nd passive ability jump boost. jump boost 1 at level 1, 2 at level 2, 3 at level 3

level 3.

The regenerate gem gives regeneration on right-click. Regeneration 1 at level 1, 2 at level 2, and 3 at level 3.

The regenerate gem has a 2nd active ability that gives health-boost. Health-boost 2 at level 1, 3 at level 2, and 5 at level 3.

The debuff gem works when you hit an enemy with the gem to give the effect. Slowness and weakness 1 at level 1, 2 at level 2, and 3 at level 3. All 3 levels also give the blindness effect. The effects last for 40 ticks at level 1, 120 ticks at level 2, and 200 ticks at level 3

The cursed gem works when you hit an enemy with the gem to give the effect. Wither and poison 2 at level 1, 3 at level 2, 4 at level 3. upgrading the gem also increases the time. Level 1 40 ticks, level 2 80 ticks, level 3 120 ticks.

If you drop a gem all of the effects will reset

Power Gems