ladder, latter

Ladder or ladder means the movable set of steps or rungs used to climb or reach things--
The firemen practiced climbing up and down the ladder.
He'll have to borrow a ladder to fix the roof.

Latter or latter ( rhymes with batter ) means the last-named of 2 alternatives--
They wanted some new furniture and a vacation, but the latter was more important.
Latter may also mean of a later or more recent period in time--
The latter half of the 20th century was an era of rapid technological progress.
Many people in the 1960's attempted latter-day homesteading.

Now that you know that, you can say--
"He needed an assistant, a hammer, and a ladder, but the latter most of all."

Note--not to be confused with "later", meaning at some time in the future, or at some time after--
I'll talk to you later.
See you later.
We can have dinner and go to a later show.
We could go to the movies later.