Need help with weaknesses

[Doom3524]

Hello, I have a few questions for anyone that can help. I am curious on a few different classes and their major weaknesses so I may exploit them. They are Half Dragon, Construct, and Lich. I know a Lich has the basic undead weaknesses, but is there anything else that will greatly hurt them (other than destroying the Phylactery as well). Any help people can give me would be greatly appreciated.

 

[genshou]

The main weakness for a half-dragon is that they have the Dragon type, which means that bane (dragon) weapons, made frequently for dragonslaying, have full effect on them.

Constructs don't really have many weaknesses other than the lack of an Intelligence score. However, check out the scarab, golembane wondrous items in your Dungeon Master's Guide for taking out golems.

Liches are vulnerable to holy and disruption weapon qualities. Other than that, you just have to find and destroy their phylactery, then take them down in combat.

 

[Inconsequenti-AL]

The 'typical' wizard lich tends to have a weak fort save. No con score and a poor fort save. So spells like disintegration can really ruin their day. But that won't work if they were a cleric or druid... Liches are generally bad news IMO.

There's a few special attacks that mess up constructs, but generally they're quite hard to hurt.

Half dragons is a bit of a vague topic - really depends entirely on what the other half is?