There are dark machinations that resonate and ripple across the ages of Io, and in this machina innocent people can find themselves crushed within the gears.  These undeserving souls might find dreadful purpose in this false resurrection, and revel in their unkillable nature.  However, every rebirth is a gift granted by an extra-planar entity, god, devil, or something else.  And, like so many elements of the Weave in Ionian lore, there is a cost to such gifts...
  The concept of an undead hero, neutral or not, exists in my world without a doubt.  Revenants are certainly not common, but they aren't unheard of.  Always seeking that greater depth of immersion and storytelling, those that do reveal themselves are never grunts or shambling corpses.  They are aware, and might have already taken steps to hide the fact that they may be slowly decomposing (herbs, liquor, formaldehyde).  Some have actively injected themselves with healing potions, syrupy elixirs of vitality, or taken to consuming infernal blood to cease the flow of rigor mortis.  And all are well aware of the passage of time - and how long remains before they turn to dust.  They may seek help from our heroes, allies to defeat their nemesis, or perhaps they've been down this road before, and have given in to their damnation.  
  My players have met two Revenants before, but I don't it was ever revealed to them (in secret or otherwise), and they will definitely show up again.  Can a player-character be a Revenant?  Anything's possible.  There's too much espionage and assassination in my world for an Archfey to not take advantage of a poor, unfortunate soul every now and then.  However, that is something that will be explored and revealed during play, not before.  No one goes in thinking they're going to become a zombie Clint Eastwood...

See you at the table.
-Adamus

Man.  I'm tired.  What I wouldn't due for some CAFFEINE.  ;)

Some baddies you find just hold a special place in your heart.  Maybe you often fall back on them because they're so versatile, or you save them for that key moment when they'll be most effective.  Could they be a striking nemesis, a freak chance encounter, or a surprising subversion of expectation?  
  I use a lot of monsters, and I make a lot of my own (that's another post altogether), but none so far have had such an "OH CRAP" moment from my players in recent games as the Remorhaz.

The Remorhaz is a traditionally arctic monstrosity.  A predator preying on elk, polar bears, and other creatures that wander into their territory.  They burrow deep into snow or ice, lying in wait for the faint vibrations of creatures moving above them.  While hidden, it can raise or lower its body temperature, keeping the snow or ice around it from melting, or allowing it to glide through the cold tunnel.
  A Remorhaz nest is quite a find, especially if you are a frost giant, as the young Remorhaz can be trained from hatching to obey commands and guard your citadels.  Some might even become mounts for other creatures.  Be careful if training these beasties, though; they are adept at swallowing their victims...

The Remorhaz has become recently fascinating to me, and not just because of their mechanical capabilities.  Residing in the grand north of the world, somewhere beyond the Wynnrik Region, the Remorhazes and their ilk would have been one of the first batches of creatures to encounter menacing Brood as they fled the collapsing Shadowfell at the turn of the 6th Age.  This means that the once dormant, territorial creatures, fought, failed, and were corrupted by the impending swarm of shadow monsters.  What came out of such a clash was an even more formidable foe.

I have a few players it seems with a penchant for getting eaten, and with an ability like Swallow, this number continues to rise.

On their turn, a Remorhaz makes a Bite attack against a creature it is grappling (snake-like body, go figure).  If the attack hits, you're looking at 6d10+7 piercing damage PLUS 2d6 fire damage, AND the creature is swallowed.  While swallowed, they are considered blinded and restrained, and will suffer 6d6 acid damage at the start of each of Remorhaz's turns.

Now, that's pretty awful.  However, your allies can deal damage to this thing while you're in its gullet.  Deal enough damage in a single turn and the thing has to make DC 15 Constitution Save or regurgitate you.  ...HOWEVER, if this thing swallowed you BEFORE it moved, it can now burrow 20 feet down (movement speed).  Without a player with Sentinel, you're in BIG trouble if they can't hit it hard enough with attacks of opportunity.  
  If you're still conscious, you might be able to get yourself out.  Restrained only brings your speed to 0, gives others advantage on attacking you, and your attacks and Dex Saves have disadvantage.  You can engage in trying to hack your way out (which at higher levels is completely kosher), cast a spell, and so on.  But if the odds aren't in your favor, your body might be SOL.

Let's shut down that Fireball and Cone of Cold immediately, shall we?

Every time a creature touches the Remorhaz or hits it with a Melee attack while within 5 feet of it takes 3d6 fire damage.  Every hit.  Not every turn, or every round.  EVERY.  HIT.
  This one is nasty.  True, average damage here is only 10 fire, but it can add up quick.  Imagine your Monk suffering 40 damage just for smacking the creature with their Flurry of Blows; sure, the thing can't take Reactions now, but the martial artist is melting.  It forces you to pay attention to a creature's mobility, economy, and range - so YAY for tactics!

After their brush with the Brood, the resulting surge of necrosis and corruption moved through the species, garnering them two new curious features.  
  First is an immunity to Necrotic damage.
  Second, a plethora of pulsing, bulbous tumors and sacks that litter their bodies.  Every time the Remorhaz suffers damage (except Psychic damage), one of the boiling tumors bursts (GROSS).  Every creature within 5 feet of the creature immediately suffers 2d6 Acid damage.  Oops.  
It makes the 5-foot radius around them extra volatile, and just like before, no saving throw.  This, coupled with the Heated Body feature, can really mess with the melee attackers and how they synergize with ranged support.
​  Keep your healers healthy, you're gonna' need it.

Also, I've been painting two of them!  Trying to follow the picture in the book for once.  So far his color test is looking really nice.  Can't wait to tighten up everything, smooth the fades, and finish him up.

Stay safe and don't get swallowed.  
See you at the table.
​- Adamus

Normally she plays casters, so I asked if she wanted something familiar, or something new.  She picked the latter, citing that a non-caster would be welcome.  Knowing her, and her trust in me, I decided to give her something with enough technical choices to engage her caster experience, without worrying about spells, and had enough oomph to keep her on the front lines (when normally she doesn't put herself there), and finally some quirk to make things a little silly.

She's mentioned wanting to one day try a Kobold, so now's a great time to try it out.  
To keep her AC high, I've awarded her a Ring Of Protection and some Bracers Of Defense.  We rolled a decent array so I'll put a high stat in Dexterity and round out her Wisdom, and our Unarmored Defense will take care of the rest.

So we started with an 18, 16, 14, 13, 12, and a 6.  We'll put that 6 in Charisma because that's hilarious, and the 14 in Strength.  18 and 16 in Dexterity and Wisdom respectively, and we'll fill out the 12 and 13 in Constitution and Intelligence.

Kobolds are one of the few races in 5E that suffer an attribute penalty.  -2 Strength and +2 Dexterity brings our Strength modifier to a lovely little +1 and our Dexterity already maxed out at 20 for a +5.  To keep this little spitfire moving, I grant the Mobile Feat (+10 feet of movement!, among other things) at Level 4, and then we'll up her Wisdom to 18 (so her AC goes up too).  

Add on her Grovel, Cower, and Beg feature, Darkvision, and Pack Tactics, this is rapidly becoming Team Advantage!  Slap a pair of sunglasses on that sucker, and Sunlight Sensitivity is no problemo.

Name: AKI
Race:  Kobold       Class: Monk 8, Way of the Open Hand
HP: 64    AC: 22    Speed: 55    Initiative: +5    
STR 12 (+1)   DEX 20 (+5)   CON 12 (+1)   INT 13 (+1)   WIS 18 (+4)   CHA 6 (-2)
Saves: STR +5, DEX +9   
Gear: BAGPIPES (used hilariously as a sled, and played every time she fells an enemy),
​Bracers of Defense*, Ring of Protection*, Ring of Mind Shielding* (just because)

In practice, Aki is bloody hilarious.  When paired with our spry halfling barbarian, the small brigade is a force to be reckoned with, felling just about every big foe I can throw at them.  In character interactions, Aki is adorable, ravenous, and entirely loud at the worst times.  Mechanically, she has lots to work with using her Ki Points, but it's always the same list, and Open Hand gives her plenty of options to pivot to what needs to be shut down each round - whether it be Reactions, pushing them away, knocking them down - plenty of choice points.  

As it stands, Aki is currently level 12 in our Knight Owls Season 3 campaign.  
I'd say the character was a hit.

See you at the table.
-Adamus