Some of these may have been suggested before, I am not about to read 31 pages to check. Also? Maaaaaan, I wish I could actually play some of these.
Angel of Retribution
You dirty my armor? You die!
At any given time, only a single enemy can be 'in-focus'. Your focus is initially determined by whichever enemy enters your line of sight first (preferring the nearest, then most dangerous, if simultaneous). However, this can be overridden by an enemy causing direct damage to you, in which case they become in-focus and cannot be overridden. When the in-focus enemy dies, your focus resets and any other nearby enemies are considered to have simultaneously re-entered your line of sight.
Enemies which ARE NOT in-focus are invisible (although their bullets / sounds are not) and the player suffers -4 to accuracy against them.
Enemies which ARE in-focus can be sensed outside your line of sight and suffer -4 accuracy against the player.
Angel of Escalation
You're not the only one on Phobos who's learning ...
Each kill nets you twice as much experience as usual. For each set of stairs you descend, all enemies gain a small incremental bonus to their stats. And each time you kill an enemy, there's an additional chance that the next enemy of that type will arm(or) themselves with higher-tier or even modded equipment.
Angel of Forging
This is the end which you point at the bad guy.
Gaining experience does not give you traits. Instead, you start with both a chaingun and combat shotgun in hand. Reaching experience levels 2 to 4 will spawn a random exotic item at your feet. Reaching higher experience levels with spawn a random unique item at your feet.
Angel of the Apocalypse
Where I walk, no demons dare tread.
Every time you step off of a tile, it turns to lava. To be fair, maze levels are not generated.
Angel of Fortune
This just got interesting.
All normal levels are generated to contain both extra barrels and a vault. The catch? Levers never safely explode the barrels and the stairs are always placed within the vault.
Angel of Fate
The die is cast, and your guns are loaded. Let blood rain.
There are no stairs to special levels. Instead, most standard levels (excluding L14 and L24) place two regular stairs. Moving onto either of their tiles triggers a flavor message. Which you choose determines the special condition for the next level. Some examples of these could be:
"So the hunter becomes the hunted ..." Spawns a boss monster.
"The hoard awaits you ..." Killing any enemy spawns two more elsewhere.
"Ugh, such a slog ..." Any damage to the player or enemies is reduced by a half.
"Even the air is jumpy ..." Explosion radiuses are increased and knockback is doubled.
And so on, to a dozen or more total.