Constellation Monster

What they are/What they look like
Constellation monsters are a type of monster appearing in StarlightSG's fanfiction, Yu-Gi-Oh! HYPERFORCE!
Constellation monsters have a background which represents outer space, more specifically a pattern representing circumpolar stars. Constellation monsters do not possess levels; instead they have "Star Clusters". They exist within the extra deck.

A Star Cluster, by XBrain130.

A Constellation Monster looks like this:

Template done by XBrain130.

How to summon a Constellation Monster
Along with the Constellation Monster Type, there also exists Constellation Spell/Trap types. These are depicted by an 8 pointed star next to their [Spell Card] or [Trap Card] definitions. Each time a player activates one of these cards, a player will gain/lose a set amount of Nebula Counters (the amount they gain will be specified on the card). To Constellation Summon a monster, a player must tribute a monster and remove an amount of Nebula Counters, equal to or more than the Star Clusters on the Constellation monster they wish to summon. Some Constellation Monsters have more than 1 monster tribute costs.
Constellation Spell/Trap cards
Constellation Spell/Trap cards are known as "Cometshower" Spell/Trap cards. They have an 8 pointed star as their icon, next to their [Spell Card] or [Trap Card] definitions. When activated, they will usually provide the player with Nebula Counters, although they can take some away from the player as a cost of activation or take them away from the opponent instead. They all state the following in the first two lines of the card's text:
This card is also treated as a *Spell/Trap kind* card.
To activate this card: gain/lose/opponent gains/opponent loses (0 to 12) Nebula Counters.
Nebula Counters
When a player activates a Constellation Spell/Trap card, and sometimes some Constellation Monster effects, they will gain a set amount of Nebula Counters. a player cannot have more that 12 Nebula Counters at one time, or less than 0 at one time, unless a card effect says otherwise. If they would go below 0 counters, they have 0. If they would go above 12, they have 12.
Special Rules
A player can only Special Summon Constellation monsters in face-up Attack Position, although they can be switched to Defense Position afterward.
If a Constellation Monster is sent to the graveyard: The player that sent it to the graveyard gains 2 Nebula Counters (unless card effects say otherwise).
Constellation Monsters cannot be summoned to the Extra Monster Zone.