Neverwinter Nights [Enhanced Edition] - Helm's Hold with a level 12 character (Katana)

The Effective Character Level mechanic gives an exp boost to a few classes, who are at specific levels in the Wailing Death campaign:
Bard can have up to 2 ECL bonus, if the character stays at level 4
Cleric up to 3 ECL bonus, if the character stays at level 5
Druids up 2 ECL, if the character stays at levels 4, 5 or 6
Monk up to 2 ECL, if the character stays at level 5
Rogue up to 2 ECL, if the character stays at level 4
Sorcerer and Wizard up to 3 ECL, if the character stays at level 5
The other remaining classes have 0 ECL bonus
Thanks to the above, my Cleric 5, Bard 4, Fighter 3 had an ECL boost of 5. This was enough to reach level 12, before going to Helm's Hold in chapter 1. This was without farming any infinite enemies and without using other tricks to increase the amount of enemies.
Level 11 loot pool features many great items, such as Boots of Speed (permanent haste and +4 to dodge armor), Full Platmail +3, +2 generic weapons among other goodies.