neslug requires patience, probably 200agi, 120+ magic , and doublecasted ultimas are prefered.... flares work... id have to say 1 mp cost will save your ethers and turbo ethers majorly so and copycat is good if you dont have flares/ultima...

IMO nesulg is easy once you know how to deal with him... but it means you need ot have seriously filled your grid's empty slots with magic, agility, and str spheres.

whats worse... is magic means you need to fight jumbo flan who requires more or less.. anima, with haste, reflect, slow and curaga.

IMO neslug is not worth the effort until you hit for 99999 every hit, can get a reasonable 40k total damage for your flares/ultimas as he ducks into his shell after a certian amount of damage at which point he casts curaga and has regen and is also immune to physical damage.