3

Swamps

The most by-the-books hag, they're good at trickery and illusions.

2

Coasts

These amphibious hags can be used for nautical adventures or brought inland via large rivers.

4

Extraplanar

Prophecies given by these hags can be great foreshadowing for longer campaigns.

5

Ethereal

The only hag to be classed as a fiend and not a fey. Their ability to haunt nightmares is a great adventure hook.

Hags have a lot of information gathering magic that allows them to know things about the PCs be🌱fore meeting them. Using d♑isguises, divination, and minions, they're able to scout most parties before they are close enough to pose a threat.

They can tailor their words and combat strategy to match their insight into the cast. Make false promises related to a characters' backstory, prepare spells that strongly counter the players' normal strategy.

Hags have access to powerful spells that are far stronger than th🎶eir level. These gibe the hag a lot to offer a party wi꧋lling to negotiate.

More specific to your campaign setting, hags are long-lived creatures that study the world and magic in great detail. They will almost always hold some relevant information they can promise the party, or drip feed out as part of a larger bargain.

A party seeking a caster for Legend Lore might be forced to barter with a Fate Hag. The Bheur hag is able to▨ Contr🔥ol Weather at nearly half the level that an equivalent PC could cast the same spell.

A player whose knowledge of fey lore comes entirely from the Witcher books and SCP-4000 is going to walk into a hag encounter thinking they follow a strict code of conduct, believing a hag's oath the same way they'd believe the word of a devil under contract. What this misses is that hags are gleefully able to break any oaths, except to other hags.

A hag can lean into the mysticism and misinformation that surrounds them, lying that they're unable to break their promises.

Hags have special abilities that only activate if the players fight the hag in its nexus of power.

There are a mixture of specific and general lair actions: Most hags can walk through walls and magically slam doors while in their lair. Green hags can displace themselves with an illusory duplicate, and sea hags caꦓn duplicate other people.

Lair Actions don't obey normal initiative: They typically activate at the start of a round. When writing down initiatives, put the lair actions at the top (or at 20 if one character is faster).

Have the hag make use of lair actions that don't directly influence combat. A hag walking through walls can attack the party from below the floor, swiping at an unprotected spellcaster an🎐d then retreati𒈔ng.

The CR two sea hag has the horrific appearance trait: Any creature to see it needs to make a wisdom saving throw or become frightened. A character who succeeds becomes temporarily immune, which you'll need to keep track of.

Have some counters set aside for this purpose. When a character passes their save, give them a counter to represent that they🐬're immune to further fear saves when yo🐠u call for them.

At the start of each player's turn, check if they have a counter. If not, they either 💎need to roll a save or 🙈become frightened.

The level four fate hag is one of the earlier creatures to have legendary resistance. Twice per day, it can choose to succeed on a saving throw that it would have failed.

Save uses of legendary resistance for saving throws that could single-handedly swing the fight. Stunning, blinding or silencing effects are the best uses.

Make a note whenever legendary resistance is used, to track the remaining uses.

Some hags have access to legendary actions, special moves that allow it to break the normal turn order of combat. If you aren't used to using these, they can be difficult to remember to use and also can confuse your memory of the initiative order.

Legendary actions take place at the end of another creature's turn. Typically a bossfight has three legendary actions per round, and moves that consume one or two of those actions.

If you're liable to forget about them, use them early and often. With practise you'll be able to use them with good timing that disrupts and counters the players' strategy. The initial goal is to get into the habit of using them at all.

A trio of hags working together can access much stronger magics and poses a greater threat than three hags back-to-back.

A trio of hags can can spells far above their level, but share charges on those spells. Describe the spellcasting in a way that encourages players to play around the coven spells and break concentration on spells like eyebite.

When using an encounter builder, keep in mind that coven hags are on average two or three CR levels higher.

The eye is easily destroyed, harming and blinding the connected hags temporarily. This gives the coven a grudge to settle and a need to recruit a new member before crafting a new eye. Hags reproduce by eating children, so the party have a ticking clock to defeat the remaining hags before this can happen.

Some players will loot anything magical, even magical eyes that watch them sleep and seek to kill them. The eye is the hags' weakness, so they'll likely send minions rather than expose themselves.

If the players refuse to engage with it, you can have the hags reclaim it without difficulty. Without the players exploiting this weakness, the coven might more quickly recover from the death of a member.