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Created for the duration of a battle with the Spirit Caller's skill with the same name. As with all other Summoned units, it is created with stats derived from the summoner's size and Magic.
The GhostBulb is a rapidly spawned summon for use in large numbers, which come in ShadowForm for a single turn. If on a slime tile, they can SpreadSlime to change the terrain for a slime team. They can also shield or attack at a good range by using up their Mana, which they replenish at the start of every turn or just by attacking normally thanks to DrainMana. ShadowBond looks out of place next to these other skills, but if there's a shadow ally that's surrounded by enemies it's the perfect set up to use the Spirit Caller's BulbConduit offensively.