D&D 5E Climbing walls etc?

[LordEntrails]

But can't my Dex rogue use Dex instead of Int for investigation? I mean they need nimble fingers to manipulate the puzzle cube to try and figure out how to open it. I know I put 8's in str and Int and wis, cuz why would I ever need those?

 

[Lyxen]

How can a troll dump Str so much ? I understand Int and Wis, but Str ?

 

[LordEntrails]

How can a troll dump Str so much ? I understand Int and Wis, but Str ?

Regeneration!