I wasn't going to grind for this trophy but it was the only one I didn't have, which stupidly bothered me. I then realised I could do it quite quickly with a bit of a cheesing 1980's style.
I would recommend doing this for the trophy only - create a new save using your existing party and then delete said save after you get the trophy.
I completed this in less time it took to write this guide - that's taking my Bard up 23 levels! Definitely seems the easiest way to get the acheivement but if anyone has a better way let us all know!
What You'll Need
A Bard of fairly high level - Mine was lvl 27 but I think you could probably do this from around lvl 20 if your AC is good enough (mine was -19).
A couple of Flame / Frost horns (you could also possible get away with Fire) with full charge, or possibly just one.
- One Mage with Lvl 7 Magician / Conjurer spells - will be a pain without this but not impossible.
What to Do
Get your party of 2 and head to the catacombs. Use you mage to teleport to the staircase on Level 2 at N8 E11 and go down to lvl 3, or walk but beware of traps. From there get your Mage to cast Ybarra Shield, Greater Revelation & Greater Levitation and your bard to play Travellers Tune and then walk to N4 E13 (running from the battle at N7 E12).
You will face some 69 Ghouls. Attack, then set your Bard to defence, and your mage to attack. Repeat until your Mage is dead! Then attack again, and use your Flame (or equivilant) horn against the Ghouls to finish them off easily. You won't be able to open the chest but that's not important. Your bard should not get hit if he / she is levelled enough.
After the battle is over, go to N3 E9 on the same level. Fight the 36 Wights and again use the Flame Horn to finish them off quickly.
This two battles will net your bard circa 153K exp! Go back to the stairs at N8 E13 and go to the second floor, then immediately go back down and repeat the two battles. Repeat until you have 2.8m exp for your bard. Then, walk home - making sure to save before you go over any traps in case you get stoned! Go to the board and see your level fly and the acheivement pop!