Swiping attack cooldown reduces by 0.2 seconds, effectively increasing its attack speed by ~25%. Applies before Ferocity's cooldown multiplier. Has no effect when transformed into a bat.
Swiping attack pierce increases by 2 (4 overall). Has no effect when transformed into a bat.
9
Amp range increases by 3 units (6 units overall).
10
The amp gains a soundwave area-of-effect attack that deals 1 normal-typedamage, has 40 pierce, fires every second, and can hit through line of sight blockers. Its radius scales with the amp's range.
Marceline can be built as both a damage dealer and a supporting character with some effect.
For a damage build, the usual trinkets like Baker's Shard and Demon Heart are obvious, as well as Marceline equipping the Vorpal Hand due to her being a melee character. Apple in practicality is the only range buff she'll need, as well as it being the only source of flight speed, makes it valuable despite the rarity. Powerometer is also a viable option as she recieves both the damage and range buffs from it.
For a supporting build, her buffing capabilites are rather weak except for a few strong cases. Devil Monster Bass is her best weapon, which provides a +1 damage boost to all nearby characters, including the high attack speed allies such as Rattleballs and Technological Terrors. She also uses Googoomamameter well, as the debuff is applied in an area around Marceline herself and not her amp platform. Outside of that, her options are limited as other specialized trinkets like Hambo only provide discounts.
She can also be used with some effect as a map-wide source of eco, as she can equip the Mystery Cave Pick and Thief King's Dagger to gain tons of cash early on, provided the player can afford Marceline at the start of a game. This is however very outclassed by other eco characters, only relegated to maps that need the map-wide coverage such as Crystal Cave.
Marceline's allies are very set in stone, as she has 3 very important allies in Hunson Abadeer, Vampire King, and Grob Gob Glob Grod, however the last ally slot is very difficult to use as there aren't many that contribute meaningfully to a setup. It can be used for holding the Monkey Farmer or for Wildberry Princess.