void killErosion(int x, int y, GameWorld gw) {
		gw.map[y][x].erosion += 20;
		if (gw.map[y][x].erosion > 100 && gw.map[y][x].type != Tile.Type.PIT) {
			lp: for (int dy = -1; dy < 2; dy++) {
				if (y + dy < 0 || y + dy >= gw.map.length) { continue; }
				for (int dx = -1; dx < 2; dx++) {
					if (x + dx < 0 || x + dx >= gw.map[0].length) { continue; }
					if (gw.map[y + dy][x + dx].type == Tile.Type.PIT) {
						gw.map[y][x].type = Tile.Type.PIT;
						break lp;
					}
				}
			}
		}
	}