Quick overview of how much damage you could get on 1 attack..
Fighter Base Damage 1d10
+ 1d6 if you expose yourself to Danger on a 10+ H&S
+ 2 damage from signature weapon (hooks’n’spikes + Serrated Edges)
+ 1d8 Merciless
+ 1d8 Taste of Blood
+ 3d4 from fully boosted Arcane Art from your Bard Friend
+ 1d4 from a Magic Weapon Spell
+ 1d4 from your Paladin Buddys Setup Strike/Tandem Strike
As a Fighter you get 2 multiclass moves, the most damage you can get from these is with these options: (i think)
+2d4 Exterminatus (Paladin)
+1d4 Viper’s Strike (Ranger) but you need a second weapon
A Wizard could also cast Polymorph on you, don’t know what will happen then.
But all in all, if you can use every ressource you have avaiable that is a
1d10+2+2d8+8d4 = 31 damage on an average,
60 damage if everything comes up maximum.
This of course is purely theoretical and won’t probarbly happen like this in a game, but knowledge is about 50% of any given conflict.
Hahah, I worked that same thing out the other day and fired it off to a buddy of mine. His response was an incredulous, “Why are you trying to powergame DUngeon World?!” I shrugged and said, “it’s not because I want to, but because I can.” It does really require a significant devotion to one shtick, along with having three allies work in tandem to benefit you, but I think that could be a pretty cool scene, altogether. Still, I’d rather have a character with more interesting options. Just say screw it and take Shapeshifter and become a Dire Bulette or something and eat my foes whole 😉
There is also more Cleric stuff i overlooked