When you cast The Beast Titan, target opponent despairs 5.

{b}{g}{u},{t}: Target opponent mills a card, then for each creature card milled this way, create X 3/3 Titan creature tokens where X is the milled card's toughness. If target opponent is Despairing 10 or more, they mill 5 cards instead. If the opponent is Despairing 20 or more, create XX of those tokens.