Player hacking with 20+ long stardust dragon

[1] Members name.

[2] Report: what rule(s) they broke (quote them).

[3] Did this affect anyone (e.g. they were using their hacks in PvP)?
Those hacks affected everyone in pvp

[4] Evidence. (If this includes chat, Phase link one or more messages)

[5] Dimension: (if this is a server report).

[6] Roughly, the time (in UTC) the offence was made. (if this is a
server report)

Mon, 5 July, 6:11 PM UTC

According to the Terraria wiki the max possible count of summons without hacks or mods is 11 (cf. Summon weapons - The Official Terraria Wiki).