Revised Size (3.5e Variant Rule)

The Problem
In many ways, the sizing rules given by DnD as standard work OK - provided you stay within a certain size range. However, this is not always possible or desirable - sometimes, rules of truly enormous objects (such as airships) are needed, and assigning something that's 150ft tall the same size category as something 300ft tall seems a bit strange. While this rarely becomes a problem under normal conditions, those conditions can sometimes change - and this is where the rules break down a little bit. This problem needs to be fixed in order for objects of sizes larger than Colossal to be a reality.

Secondly, even within the given size range, the rules don't work so well when things change size. Since each category gains a net +8 Strength, and a change in size category grants an effective +5 Strength or so for the purpose of carrying capacity, things larger than a certain size would eventually become crushed by the gravity acting upon them. However, it's a fact that such large creatures exist (otherwise, why use these rules?), which means that sizes have to be adjusted a bit to make them work.

Lastly, size-based modifiers to Hide checks need to die in a fire. The whole notion is rather ridiculous, as gnomes don't have an advantage to hiding from other gnomes, while giants are not at greater risk of being spotted within their own communities. While the Hide rules have a lot of issues, this is a major one which needs addressing immediately.

The Solution
First of all, Colossal+ receives a name - Titanic. This is just a name change.

Secondly, we need to find a way to continue to name size categories bigger than Titanic without constantly having to find new adjectives to use. To do this, we simply restart our naming scheme with a prefix, and re-use the categories we already have. To this end, the following system of prefixes is added. While it is very unlikely some of these would see any use, they are included for the sake of completeness.

To illustrate how this system works in practice, the first scale, and some of the second, have been written out here. Note that Hide modifiers by size are not included - this is intentional (see below).

1 The given reach value is for 'tall' creatures. This, and the creature's space, is defined as the middle value between the largest and smallest dimension available to the creature. For 'long' creatures, reduce this by 5ft, to a minimum of 0ft (if Tiny or smaller) or 5ft (for Small or larger).

Additionally, when a creature's size increases beyond Medium, they gain +10 additional Strength per size category rather than +8. This does not change current monster ability scores - just ones that are advanced to a bigger size.

Additionally, for exceptionally large creatures, the penalty they take to AC and attack rolls represents the average size their attack covers. If an attack that relies on an attack roll is aimed at a creature whose speed is less than the size of the attack, that creature is considered flat-footed against it.

Example: A Macro-Fine airship hits an armoured human (speed 20ft). Because the human's speed is less than the negative attack modifier of the airship (-24), the human is flat-footed against this attack.

Lastly, Hide penalties or bonuses for size are gone. Instead, for the purposes of such checks, the size of the thing attempting to hide is compared to their environment, as defined on the following table.