No, that just messes with light levels; that does not negate the existence of cover or allow you to identify everything about your surroundings. If definitely isn't infinite spot or listen bonuses; if I have good darkvision that equals the same thing.
Last time I checked, darkvision doesn't have a "revealing itself and all features" clause. Lifesight is basically the equivalent of mindsight.
You're reading stuff into it that isn't there. Darkvision does have that clause: if it's pitch black, normally I cannot see anything. If I have darkvision, then I can see all the features of something and its surroundings. All that line is saying is that the illumination isn't just a bright light alerting you to the presence of life, it's something you can see by.
You do realize that lifesight is usually considered one of the best special senses out there, in par with mindsight and the like, right?
By your interpretation, lifesight is completely redundant with darkvision. And undeads get darkvision by default. Meaning you're claiming that a lot of guides out there advise you to get an useless feat.
Not redundant, since Darkvision has a hard cap distance limit, and doesn't centre itself on living creatures. I do not, however, agree with guides that say it's an outright amazing sense. Unless the DM's going to rule that no amount of hiding skills or abilities are useful. But that's the
DM making it an infinite spot check.
And it also completely fails for any
other use of spot than 'oh, hey, living thing'.
And how many good homebrew classes completely lack access to all sensory skills?
Wizard and cleric don't have spot or listen. Anybody ever complained those ones need them as class skills? Many wizard and cleric clones that are extremely popular online don't get those either.
How many good homebrew classes, I said. Things that are, essentially, clones of the most broken classes in the game? Not really.
Well, the problem here is that "good" is quite the subjective word. Sirpercival's warcrafter isn't a spellcaster, doesn't have sensory skills, and is extremely popular.
That's one. Now, how many
do have those as class skills?
And then bloodhulk also shruggs off poison, mind-affecting, critical hits. Warblade and crusader... Die to a lucky crit from some random 1st level orc with a waraxe. They grab diseases when they enter the cursed swamp. And then they can't go in the underwater caverns because they need, to, you know, breath.
Bloodhulk dies due to a lucky hit from a 1st level orc with a waraxe, too. If it's not at full health? Well, a first level Bloodhulk has either 22 or 24 HP. So, I roll a 12 for my damage roll. Plus 5 from strength and a two handed weapon. Plus six because it's slashing and it got lucky on the bonus damage. 23 damage already. If you're on full HP, at best you have exactly one HP left.
Which is still more than -11, and also more than enough to punch the orc back and win the battle.
Mind you, I meant more around levels 3-4, where the waraxe orc can still one-shot living PCs, while an undead is shrugging it off like a boss.
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More than -11? Only if you're at full HP.
Though yes, at level 3, of
course the creature with an intentionally bloated HP pool is going to survive a critical better.
So, what abilities does this have at level 3? More HP, a rather small STR bonus at this stage, some AC (but not actual armour), the ability to translate its HP pool of 52 into save rerolls as well as... well, HP, and an okayish slam attack. And something that's still technically worse than just having spot and listen as class skills. Meanwhile, it takes extra damage from anything pointy, and absolutely
sucks at anything other than hitting something that happens to be right next to it.
So I guess it's not all that different from a barbarian with some immunities stacked on top.