From the Super Mario Wiki, the Mario encyclopedia
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Monstar is a ghost-like monster from Paper Mario. This creature appears and ambushes Mario and his partners as they approach the outskirts of Starborn Valley, where it warns them to "turn away" and "go no further", lest they be "eaten". The player will then be presented with the choice to either flee the area or fight; choosing the latter option will initiate the battle.
Despite an intimidating appearance and an attack consisting of a flurry of shooting stars, Monstar is in actuality an easily defeated boss that poses little to no threat to Mario, having only 20 HP and an attack power of 1. Upon its defeat, the creature is revealed to be nothing more than a handful of Star Kids trying to protect the valley, who attempt to give one last warning before retreating.
Monstar also appears in the 27th issue of Super Mario-Kun. It terrifies and attacks Mario, Goombario, and Kooper, but when Mario defeats it, many Star Kids reveal themselves and escape, surprising Mario and his group.
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