|Learnt At||60 of covert.stealth & covert.item.weapons|
|Guild||Thieves and Assassins|
The Thieves' Guild does not teach covert.item.weapons above 50 levels, but this can be bypassed by advancing covert.item.weapons to 50, then covert.item to 60.
To land a successful backstab, the attacker's covert.stealth and covert.item.weapons is checked against the target's adventuring.perception. Once the attack lands, the first attack should nearly always land, unless the attack is a near miss ("somehow avoids the attack") or no attacks are attempted at all. Zero attacks is apparently a long standing bug of the command, but should now be quite rare.
Once a successful attack is launched, the target could receive stat damage; this varies from -1 in one stat, to -1 in all stats for a short period of time. A critical failure of backstab can also cause stat damage on the attacker. The check for this is covert.item.weapons vs covert.item.weapons.
The primary skill for damage seems to be the melee of the attacker, the attacks themselves are checked against the target's defence. There is a maximum of four attacks.