By not moving for one round you can become invisible doing this you become invisible and your movement speed decreases by 1/3

If you are attacked with non magical damage from a metal weapon you have resistance the attacker then rolls one d20 on a1or2 the weapon breaks on a 3or4 it has a permanent -1 per damage dice (these can add up)

You head but your opponent causing them to be stuck in your head 1d6 acid damage per round and grappled. they also cant be heard by other creatures while in the cube (voice)(the voice thing only works on creatures with a small enough head eg a human /goliath or smaller ) on a con save of 1 take an extra 3 damage

If you're hit by a certain amount of fire damage then you melt into a blob While a blob you can’t attack and you move at1/3 speed , you can’t attack or use actions to do anything that involves hands or a body (including spells) it takes an action to reform when you roll up your character roll a d6 and that is how much it takes to melt you (this increases by 1 d6 every level 

when hit by too much ice damage you are frozen While frozen you can't attack you move at1/3 speed , you can’t attack or use actions (including spells) it takes an action to unfreeze when you roll up your character roll a d6 and that is how much it takes to freeze you (this increases by 1 d6 every level 

You can adapt well To any skill 

If you're hit by a certain amount of slashing damage then you turn into two smaller cubics While a small cubic all your stats are halved it takes an action to reform. when you roll up your character roll a d6 and that is how much it takes to split you (this increases by 1 d6 every level ) (the smaller ones can be halved (it stacks))

the cubic speaks telepathicly