Disambiguating B/X Damage Types

I was reminded of how far ahead B/X was for its time while reading the monsters section in the Basic and Expert books for research for the monsters in Gunslinger (where they are called Critters). Different types of damage are succinctly described in game terms as a handy reference. This is the beginning of the systemization of damage in D&D. Comparing this with damage types in 5e there are only a couple in common, and arguably a third.

B/X	5e
Acid	Acid
Charge	Bludgeoning
Charm	Cold
Continuous Damage	Fire
	Lightning
Energy Drain	Necrotic
Paralysis	Piercing
Poison	Poison
Swallow	Psychic
Swoop	Radiant
Trample	Slashing
	Thunder

5e has come a long way in clarifying and categorizing damage types, while B/X conflates damage types with attack types and with what would come to be called Conditions. The only shared damage types are Acid and Poison and possibly Energy Drain. Of the remaining types Charm and Paralysis are Conditions in 5e. Charge, Swallow, Swoop, and Trample are combat attack actions. 

This leaves Continuous Damage and Energy Drain. Of these two types Energy Drain has fallen out of favor (as if it was ever in favor!) and Continuous Damage which is really something of a modifier you could theoretically apply to any damage type.

If we look at Energy Drain a little closer it does exist in 5e, but in a very different form called Life Drain. It is sort of a condition/action hybrid. As a damage type it is similar to Necrotic damage. This is what it does:

Life Drain: Necrotic damage. The target must succeed on a DC 14 Constitution saving throw or its hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.

At first glance reducing hit point maximum may seem a bit lame, not as scary as losing a whole level like in B/X. But it is far easier to calculate and more immediate, you can lose quite a bit of time looking up what it means to reduce a character's level. Also, it is scarier than you might think to the player as it reduces how much they can heal.

To disambiguate the Damage Types as listed in B/X it would look something like this:

Damage Types

• Acid
• Continuous Damage
• Poison
• Energy Drain

Conditions

• Charm
• Paralysis

Attack Types

• Charge
• Swallow
• Swoop
• Trample

I quite like this list and think it is a good start to creating a system of damages, conditions, and attack types. There is a clarity of thinking here that 1st Edition AD&D could have benefited from. Well, we did eventually get that in 2nd edition. Maybe a bit too much.

One other interesting note is the order the damage types are described in. They are not alphabetical in the book, so they come across as random train of thought. What is it about those early D&D books and the random inconsistent use of alphabetizing?