As an action you can absorb an ooze. 
Starting at challenge rating 2 and below, the target must be in a weakened state. Con check 17 to succeed, on a fail the target takes 2d6 hit points from you and heals for that amount. On a success, you fully absorb the ooze and heal its health die. This kills the ooze. 
Lvl 1/5 : CR 2 fail 2d6 success 1/4 max health

Lvl 2/5 CR 4 fail 4d6 success 1/2 max health 

lvl 3/5 CR 6 fail 6d6 success 3/4 max health 

Lvl 4/5 CR 8 fail 8d8 success health die plus half health

Lvl 5/5 CR 10 fail 10d10 success max health