The word is mixed from BOO and Tomb.
You will get help from Vampino, and you will need to fight Flow in one mission.
The theme is Halloween.
Mission 1: Here comes the ghost[]
Normal +2300 exp Unlocked at Lv.41 (3 times)
Description: There's a place called Bootomb. It's kind of creepy...and I heard that people are seeing ghosts there. Can you check there for me please?
Hard +2850 exp Unlocked at Lv.xx (3 times)
Mission 2: Zombie rush[]
Normal +3000 exp Unlocked at Lv.41 (1 time)
Description: Zombies! Zombies are coming for the crops!!! Help us!
Hard +3700 exp Unlocked at Lv.xx (2 times)
Mission 3: Franken[]
Normal +??? exp Unlocked at Lv.42
Hard +3100 exp Unlocked at Lv.xx
Mission 4: Where is my home? :([]
Normal +2200 exp Unlocked at Lv.42
Hard +2700 exp Unlocked at Lv.xx
Mission 5: Let's collect nightflowers[]
Normal +2000 exp Unlocked at Lv.42
Hard +2400 exp Unlocked at Lv.xx
Mission 6: What is going on with Flow[]
Normal +2800 exp Unlocked at Lv.45
Hard +3500 exp Unlocked at Lv.xx
Mission 7: Who's faking me[]
Normal +2800 exp Unlocked at Lv.45
Hard +3500 exp Unlocked at Lv.xx
Mission 8: Night of Sercubus[]
Normal +3500 exp Unlocked at Lv.48 (3 times)
Hard +4000 exp Unlocked at Lv.52 (3 times)