FTL is a strong assist system, where any toon can lead, and once set up the slaves correctly assist the active character.
It does not rely on using Focus, which is the easiest method, so focus is free for CC's or PvP use.
It does not rely on using Party Leader, where your slaves assist the leader of the party.
I believe the T stands for Target, where the slaves do not need to actively target the recipient of their spells/abilities.
FTL is the hardest assist method to set up, but the strongest once done.
