Power halved in Tactics

Normally, having damage and health depends on what level you are on and what battle gear you have equipped. I'm not exactly buying that "I'm level 50 wearing a full tier 3 legendary armor set" thing because with that I got over 3k health. Albeit, I have a tier 3 legendary sword and I have between 430 base damage. (which used to be around 770 base damage from what I remembered. You're not alone on that, I'll tell 'ya)

But all that aside:

If it is a glitch (though I still think it's intentional), it will take some time to get fixed. In the meantime, if you want any advise, try adopting a different battle strategy other than throwing your weak Viking into the frontlines on (especially) high level battles. If your dragons go, you can continue, but if your Viking goes, it's game over.

I would recommend healing dragons like a Prickleboggle. They may not do any damage to enemies, but they are the best —most efficient healers (being able to heal any ally surrounding them at once, heals a target restoring a huge chunk of health and gives the target regeneration, and can camouflage to dodge most attacks).

You can use the Tide glider as well. Although they are less efficient healers than prickleboggles, they can do damage to enemies; plus, they have boosted speed. :P

Or you can try dragons that damage multiple enemies at once like a Monstrous Nightmare, Flightmare, Thunderdrum, or any other dragon because I haven't owned all of them (in addition any dragon with the role, Aura).

And finally, if you like mid-long range, try using the Skrill, Wooly Howl, Snow Wraith, Toothless, Light Fury, or any other sniping dragon out there.

What I do in Dragon Tactics is use have 1 Healer (a prickleboggle), 1 Sniper (a skrill), and 1 Tank (a whispering death).

I keep the prickleboggle in back to protect it and have my skrill to snipe out enemies one-by-one. I usually have my Viking next to my whispering death (sometimes behind her if my Viking is weaker) and deal with the fewest enemies as possible before moving on.

Whenever anyone gets hurt, my healer will easily patch them good as new. Each critically injured dragon/Viking retreats to the back of the pack and keep my tank in front to take the hits with the Restore effect.

That's how I won the lvl 50 Icestorm Island level while my Viking was still a level 15 with 70bd and 800hp. Each of those dragons were high level. The Skrill and the Whispering Death were both titanwings.

TL;DR:

All information provided is just giving you a recommendation. In short, adopt a new strategy then just throwing your Viking out there to take the fall for your dragons. Tsk, tsk, tsk. Selfless, but risky move. Devise a plan for your battles. Get tactical! :D

You may also try to use a Sand Wraith, if you have any.

They do almost no damage, but when they camouflage or defend, they never get hit. That´s right, never. They dodge all attacks, regardless of dragon level. Now this might be unintentional (one of the very few times where a glitch works in the players´ advantage), but it works.

This does not happen with other dragons´ camouflage ability. Prickleboggles, Snow Wraiths, Light Fury all take a hit from time to time.

Yeah, i had the same problem (that luckily got fixed), but if yours still didn't get fixed, i have a few tips for you. One of the best squads i have ever used is:

Night fury: a mid and long ranged dragon with 835 damage for the base attack (at level 50), 2035 damage for the second attack (at level 50), 2100 health (at level 50), and an alpha abily to increase dodge and damage. A perfect sniper that can easily take out the enemies, even at high levels such as the final icestorm one. I recommend this dragon, it's truly amazing for tactics.

Skrill: Another deadly sniper with 2 attacks with long range, and one with close range, with 780 damage for the base attack (level 50), 1580 dagame for the seconds attack (level 50), an electic attack that can damage up to 4 enemies with 1580 damage (at level 50), and 2100 health (level 50), this dragon is one of the best snipers ever, it can hit enemies from very far away, really recommend it.

Thunderdrum: A health tank with mid and close range, with 3600 health (level 50), a sonic blast with 732 damage (level 50) that can hit multiple enemies depending on the position, a bite attack with 1080 damage or so, sorry i don't exackly remeber (level 50), and a charge ability to increase the firepower. The second strongest health tank (first is the gronkle with 4000+ health) that also has a decent damage, and an attack that can hit multiple targets. If you have this dragon, use him as a shield, instead of using your viking, he'll be able to take a lot of hits, and using the dodge action you'll also be able to save him from most of the hits. I prefer using this dragon as a health tank instead of the gronkle because this one has a decent damage, thing that other health tanks don't have.

Use these dragons and you'll win easily, even with a weak viking, that's how i won the icestorm levels without being level 50. The important thing is, level your dragons. Level them up to increase their power, and you'll win in no time.

Hope this helps! ^^