the rat king is such a boring fight for the tank, there is nothing to do other than stand there and keep agro(which isn’t hard at all is you have a decent provoke speed, don’t know about paladin tho).
please add at least some mechanic for the tank to deal with, something as simple as a tank buster in the rotation would help.
as for the slime boss there is no need for a tank (this also goes for the last boss in the first dungeon) which kind of worries me, if there are bosses where you don’t need a tank and there is no clear advantage in having a tank I fear that players who don’t want to play multiple classes and only level a tank are not going to be very “attractive” so to speak for guilds/end game groups and either lose interest in the game or feel forced to play another class they might not enjoy.
IMO all bosses should require a tank or at least have some relatively big advantage in bringing a tank instead of a DPS.
To improve the fight I think he should be faster and the random switching between players should be removed.
These two changes would mean you’d need a tank as he wouldn’t be as easily kitable, you could move him between the water things quicker to reduce the kill time and the random switching between players I think will be mostly just confusing for new players doing the dungeon for the first time and also makes having a tank pointless.
I can’t remember where, but I seem to remember someone mentioning that there weren’t going to be tank busters in reborn. could you confirm if this is the case or not? and if it is the case then please reconsider. shield management is one of the big aspects of tanking as a warrior and without tank busters there isn’t much of it. I also think it could be interesting for paladins maybe have some active ability that lets you take a hit that would normally kill you in exchange for orbs.
if you’re not going to add tank busters at least make sure there are a couple mechanics for the tank to worry about too.