Skulltaker

Against non-vehicle models, Skulltaker's close combat attacks are Rending on rolls of 4+ instead of 6, and any of his Rending wounds also inflicts Instant Death

Independent characters follow the Movement rules for models of their type, be it infantry, jump infantry, bike, etc. In addition, independent characters can move through difficult terrain more quickly and safely than ordinary troops. All independent characters have the ‘move through cover’ and ‘skilled rider’ special rules. This advantage does not extend to any vehicles they may be travelling in.

Independent characters are allowed to join other units. They cannot, however, join vehicle squadrons (see the Vehicles section) and units that always consist of a single model (like most vehicles and monstrous creatures). They can join other independent characters though, to form a powerful multi-character unit!

In a turn in which they assaulted into combat they add +1 to both their Initiative and Strength characteristics when attacking in close combat (note that this has no effect on the Initiative tests for sweeping advances).

Models with Iron Hide receive a 3+ Armour save.

The close combat attacks of a model gifted with the Fury of Khorne gain the Rending special rule.

A Daemon has a 2+ Invulnerable save against wounds caused by psychic powers or force weapons.