Only Wrote:Why all curses, amplify is the only useful one.
Well, usually becuase summoners have a buttload of extra points.
Dim vision is good vs ranged attackers, and if you devote a few more points to it the range on it is very high.
Decrepify is another very useful curse, if you have problems with skellise dying vs bosses cast Decrepify on the boss, then cast clay golem right next to them. Usually the boss will target the golem so when it dies simply recast. Recasting golem is easy so I wouldn't put a whole lot of points into clay unless of course you have those extras.
Also if you play with a lot of parties then Lower resist may be worth a few points.
I also forgot to mention to put one point into Corpse Explosion, always useful against swarms of enemies.