I actually did dual an Assassin to a plain Fighter in an effort to improve the THAC0. It can work. But it requires patience.
However, if you retain the Assassin as a pure class, and advance to ToB, you will get access to a couple things -
Alchemy skill, which allows you to make potions
Use-Any-Item skill, which lets you use any armour and any shield, helms, etc.
- So, you can then put on full plate and drink potions of invisibility, allowing backstabs all the time. Items like the Helm of Balduran can improve the THAC0. The armour class of your thief will drop like a stone, allowing greater durability in battle.
Conversely, a Fighter will get the Greater Whirlwind skill, allowing multiple hits(10) per round. If you go from Assassin to Fighter, you'll become a dreadful poisoner. You can't lose either way.
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