The Therium bloon is the 1st boss. Just like all other bosses in BTD5 expansion, it comes at the begginning of the round, then when it is popped, the normal bloons move in.
It takes 5 hits to pop on ,medium 6 on hard and 4 on easy. It moves as fast as a blue bloon. When popped, it's children are 2 reds.
It is brown, with streaks of silver.
PLZ COMMENT AND RATE!!
And go easy cuz this is my first conception.