Could you please explain some of the game mechanics?

For a Warlock, the racial ability completely bypasses all defense and immunity, reducing it to an irresistible magic level. If we consider a skilled level, this is 50%. This means that at least 50% of the damage will always be dealt. This applies in cases of resistance or complete immunity to a specific school of magic or all magic in general. If there is partial protection, it is subtracted from this defense. If the opponent has Silanna's Cloak, other races will deal only 50% of the total damage with earth magic. However, the Warlock will bypass 50% of this defense and deal 75% of the damage with that magic. The same applies to the reflection skill. Other races will deal 85% of the total damage with it, while the Warlock will deal 92.5%, and so on with all such properties that reduce damage. If the irresistible level is different, the numbers will be different.