it really depends on who else you have and where you're most interested in improving. of the two, stag knight is the more broadly applicable; there's really no area of the game in which he isn't an excellent champion. however, there are a number of champions who offer similar abilities to his and could be used in his stead. in contrast, coldheart is a bit more limited in scope, but she's absolutely amazing in her areas of expertise.

Thank you for your reply. The one I need most at the moment is decent accessories. So I need to go further in spider den. And also fire knight for better stun set. Which one would be better suited for the job?

Cold heart will save you on fire knight, she is the only one who can make her job, multi hits and the 3 skill do a lot of damage and decrease to Zero the attack bar of bosses like spider and Fire knight, relentless set or reflex set is the best option for her. Stag is really op but have more options for the same function.

Ps. sorry for possible mistakes on the written, not my first language.

Thank you for your advice. I will go with coldheart first. Never thought I would have such a happy worry. I can see stag knight will be great. too. :)

I'd say depends on where you are in the game. Coldheart is awesome, but she takes some gear to make the most of her. Stag Knight is also a fantastic champ, but much easier to gear out. Coldheart rules FK and Spider, Stag Knight can play in any content in the game. 

definitely coldheart in that case. fire knight and spider's den are her two best areas.

What does your roster look like, and where are you at in FK/Spider?

I agree. But stag is great in both as well.  

Without seeing roster its tough to say, but I think stag might help you get further in all dungeons while you get the next set of chickens for ch.  Also, how many epic books do u have?

Miscreated Monster and Ultimate death Knight for rank six max. I take both whenever I take stag knight or cold heart to ensure their survivial. Kael the damage dealer. Spirit hoist is level 60 for the speed tune. There was no way I could make her go faster without sacrificing others' speed. Evicerator is also maxed and serves as debuffer and damage dealer according to affinity.  I've played less than 60 days. High Khatun, level 50 but she dies too early and needs upgraded too. I have Bellower, Soulbond Bowyer and Fellhound at rank 4. I've only just got them. I only have 7 epic books and booked stag knight twice. But Miscreated Monster also needs the books. MM has so dar used 6 books.

Dragon's Lair, conquered level 17. fire Knight level 14. Spider den level 13 conquered, but it seems to take forever to complete a round there.

My shard luck had been pretty terrible. It's only now that I got some decent champs. :)

Obviously, the gear and accessories are a huge problem for me. Ultime death knight has only one accesory. Even maxed chaps are wearing 5 star gears (mostly rare). Not a single 6 star speed boots among them. :(

Udk, spirithost, eviscerated won't be on spider20 or fk20 teams.

Both stag and ch will.  HK is likely more useful as well than above 3.  Booking MM and stag until you get cooldowns is important.  After those 2, an armiger could be the final piece to spider20 and fk20.

A screenshot of roster will help us make sure you aren't missing anything else helpful. 

i

There are some food champions. You will probably notice quickly. And some for faction wars. Also, is warmaiden still need to be built up fully now that I have stag knight. Obviously I will develop and use her for faction wars but not a priority at the moment. 

Thanks everyone for your input. Really helpful.

ignore what i said earlier. based on the current state of your roster, you should absolutely build stag knight first. his versatility means he will provide much more benefit to your account at this time.

with stag knight, there is no reason to build warmaiden.

i

There are some in the master vault such as fell hound, bellower, wretch, coffin smasher and corpulant cadaver, but it won't let me take the screen shot for some reason.

Agreed. Stag Knight is the way to go here. He's the best improvement your roster can get right now.

Thank you for your advice. :)

Thanks guys. I just pulled 1 4 star chicken and 10 3 star chickens from my 11 ancient shards. Pretty sad, but stag knigh's rank upgrade will be that much sooner. :)

any update on this. i got STAG KIGHT. I am on Earilier stage. want to build him for longer usage in high things specially in DOOM TOWER, HYDRA, CLAN BOSS

Stag Knight is an excellent all around toon that can help with dungeon progression in all of the artifact dungeons.  He is also very useful in arena for mid-game players.  You can't go wrong with building him.