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Halo d20
"What's this?" I hear you ask. "Since when did Bungie's awesome Halo 2 become associated with D&D?" Well, for those of you who're familiar with the Xbox's most influential first-person shooter series, let me explain: A while ago, a group of us posters on the Wizards of the Coast forums had gotten together and pooled our ideas for a Halo-related d20 project. It involved implementing a *lot* of d20 Modern rules, most of them beyond my comprehension. Fortunately, my contribution was to be implementing statistic blocks for the "Flood", which were the nasty alien parasites that'd overwhelmed the later levels in the original Halo, as well as Halo 2. It would've normally taken me no time at all to have posted the work I'd already done on the Halo d20 thread, as I'd already written the stats up a while ago (Yeah, I'll freely admit I had a desperation for seeing the Flood in D&D. XP)

The Flood
[ Infection Forms ("Rangers") | Flood Warriors | Carrier Form ]
The Flood are a species of quasi-parasitic virus that currently reside within their imprisonment deep within the bowels of alien fortress worlds… each constructed by an ancient and now-deceased civilization to both study and quarantine the deadly virus. As tenacious in their aggression as they are numerous, the flood know no fear, surrender to nothing and retreat from no battlefield. While the hideous parasites appear inherently mindless, infected organisms have shown a surprising capacity for strategy, handling technology and even casting spells. They appear capable of preying upon any living organism with self-awareness, biomass and ample calcium stores, so certain creatures that lack such anatomical makeup (such as Legkolo, who’re essentially large annelids), seem impervious to infection, although this has yet to be confirmed.

At the date of this writing, there are known to be four different types of the flood virus. The first and most basic type is the Infection form, which seek out any organism capable of sustaining the virus and embedding itself into the creature’s thorax. From there, the host changes into either one of two other types of Flood; a “warrior” class, or a “carrier/incubator”. The exact outcome of a host’s infection is largely dependant on how badly-damaged the organism’s body was when infected. Relatively healthy and well-preserved bodies become flood “warriors”, whilst creatures that’re too badly damaged, or lack sufficient biomass and constitution to become hosts of the fighting class, become carriers.

The fourth type of Flood is what could only be described as a “command” form, such as that witnessed by the transfusion of Keyes’ remains into a solitary, bloated growth operating the Truth and Reconciliation aboard Halo Installation #04. 343 Guilty Spark had also briefly mentioned the existence of “spores” during his description of the flood’s reproductive nature to the Master Chief, which might’ve only been a synonym for Infection forms, or perhaps even a more basic variation of the flood parasite.