Lodizal is not exactly tough. One well balanced 55+ group (incl. at least 1 Warrior using Defensive Discipline, 1 Cleric, 1 Slower + 3 other classes, preferably high damage dealers) can kill the turtle pretty easy. Lodizal double hits for max. 300 and has about 30k HPs. Godlike damage but without all the gimicks (AE Fear, AE Damage, Complete Healing) it one of the best mobs in the game in regards of risk/reward ratio.
It usually drops one or two shell pieces for the shield quest, the map for the mask quest, one or two items out of the other loot (Boots, Ring, Club, Belt) and 2-4 level 59/60 Velious spells.