According to Pcyborg, which he posted a bit ago, Legion is the official term of "Archetype", just as Sentinels are the official term for "Perfect Guards" and Forerunners are the official terms for "Starting Vanguards".
Except for Legion/Archetype, these official terms are explained on the card (url=http://cardfight.wikia.com/wiki/Divine_Sealing_Kid,_Soh_Koh]Forerunner, coined officially as of BT09[/url] and Sentinel, though its effect is pretty universal in all clans so the term is just to name it). But these are rarely used IRL, and everyone seems to follow what the anime says as reference (Kanzen Bougyou or Kanzen Gaado, I think, usually means Perfect Guard, so everyone just calls them Perfect Guards).
All you need to know when making a deck are your staples:
8k Vanilla Boost
10k Vanilla Intercept
Starting Vanguard
Perfect Guard
Aside from Starting Vanguard, you pretty much need four of these staples in your deck.
Except for Legion/Archetype, these official terms are explained on the card (url=http://cardfight.wikia.com/wiki/Divine_Sealing_Kid,_Soh_Koh]Forerunner, coined officially as of BT09[/url] and Sentinel, though its effect is pretty universal in all clans so the term is just to name it). But these are rarely used IRL, and everyone seems to follow what the anime says as reference (Kanzen Bougyou or Kanzen Gaado, I think, usually means Perfect Guard, so everyone just calls them Perfect Guards).
All you need to know when making a deck are your staples:
8k Vanilla Boost
10k Vanilla Intercept
Starting Vanguard
Perfect Guard
Aside from Starting Vanguard, you pretty much need four of these staples in your deck.