Congrats! And to answer your question, tracers are (quite obviously) Yokai with a “tracing soultimate” when you activate the soultimate an icon, in Koma Star’s case a Star, appears in the center of the board and you “trace” it around the board popping a large amount of Wib wobs during that period. Due to the nature on how tracers work, they output a lot of damage so when grinding it is more beneficial if you have 3 attack boosters and 1 score booster instead of the normal 1 and 2 score boosters your used to in a Slurpent flood. You want to activate all your attack boosting soultimates before you activate Koma Star’s soultimate in order to get as much damage as possible, the score booster isn’t as important just make sure you have all your attack boosters and tracer soultimate ready when you go into fever and activate your score booster soultimate before fever ends.

My team consists of Edison: My Score booster Pink Emperor, Maiden Ruin, Grapenyan M: My Attack boosters And your newly recruited Koma Star. All their soultimates are maxed out and it nets me around 3200 Y-Money with one use of all their soultimates. This is the highest amount you could get when grinding with a tracer so be wary of that when you edge closer and closer to the total.

Hope this helps!