I'm making a Role-Playing Game (V. a0.0.4) and for the first 'boss battle', i guess, I need a poison attack. Just like a green dart that shoots like you're using magic & saps health at low, (around 3 hp per second for 5 seconds), medium (around 6 hp per second for 7 seconds) and high (10hp per second for 9 seconds). But, the three different damage levels are different weapons.
EXTRA: If you could make the player turn green and emit 'Player Bubbles' or 'Player Foam Droplets', that'd be great!
